James 1:12-18

What is the Purpose of testing?

There are at least three purposes for testing. God tests the heart to expose it, to purify it, and to judge it.

Expose.

Repeatedly God told Israel that he was testing them to know their hearts. “The Lord your God has led you these forty years in the wilderness, that he might humble you, testing you to know what was in your heart, whether you would keep his commandments or not (Deuteronomy 8:2).” (See also Exodus 16:4; Deut. 13:3; Judges 2:22, 3:1, 3:4, 7:4; 2 Chronicles 32:31.)
To remain consistent with the testimony of scripture we must not therefore assert that God learns. Learning (as men learn) is impossible for God, because learning implies the filling of a privation. God is “perfect in knowledge” (Job 37:16). Psalm 139:4 says, “Even before a word is on my tongue, behold, O Lord, you know it altogether.”
Calvin, in his commentary on Genesis 22:12, said, "But how can any thing become known to God, to whom all things have always been present? Truly, by condescending to the manner of men, God here says that what he has proved by experiment, is now made known to himself. And he speaks thus with us, not according to his own infinite wisdom, but according to our infirmity. Moses, however, simply means that Abraham, by this very act, testified how reverently he feared God."
Just as God fulfilled [or demonstrated] Abraham’s justification (James 2:23) through the sacrifice of Isaac, He is pleased to demonstrate the content of the heart of his children through various trials. I understand this to mean that the Persons of the Trinity glorify each other as they see the outworking of what they have produced in the hearts of men.
As it is always when God glorifies Himself the benefit of an exposed heart is great to the believer. Here James’s meaning in verse 12 can be seen clearly. When God exposes His child’s heart the child sees and his response will be a confidence that God has worked within him and will continue to work until he receives the crown of life. This assurance encourages that man’s heart and thus he runs under the full confidence of the working of God. “Work out your own salvation with fear and trembling, for it is God who works in you, both to will and to work for his good pleasure (Philippians 2:12,13).”

Purify.

"Do not fear, for God has come to test you, that the fear of him may be before you, that you may not sin (Exodus 20:20)." (See also Deuteronomy 8:16.) God tests his people for the purpose of purifying their hearts from the dross of unrighteousness. Proverbs 17:3 says, “The crucible is for silver, and the furnace is for gold, and the Lord tests hearts.” (See also Job23:10; Psalm 66:10; Proverbs 17:3; Isaiah 48:10; Malachi 3:3; Hebrews 12:10; 1 Peter 1:7)
God has ordained trials to be a primary mode by which He sanctifies His elect. This purpose of God is seen in James 1:2-4. James declares that we are made perfect by persevering through trials. I understand this to be because the regenerate heart desperately holds to the Lord and so trials will not destroy it, but simply strengthen its reliance on Him and burn away worldly affections.
Using trials to purify His children glorifies God. In Job 1 Satan said to God, "Does Job fear God for no reason? Have You not put a hedge around him and his house and all that he has, on every side? You have blessed the work of his hands, and his possessions have increased in the land. But stretch out your hand and touch all that he has, and he will curse You to your face." When God took away all that Job had he still blessed the Lord. By this God proved the surpassing value of His glory.
The believer will also consider purification by trials a great benefit. James 1:2-4 says, “Count it all joy, my brothers, when you meet trials of various kinds, for you know that the testing of your faith produces steadfastness. And let steadfastness have its full effect, that you may be perfect and complete, lacking in nothing.” The regenerate person will consider being made more into the likeness of Christ a grand reward for going through trials.

Judge.

Finally, God tests the heart for the purpose of judgment. Jeremiah 17:10 says, "I, the LORD, search the heart, I test the mind, even to give to each man according to his ways, according to the results of his deeds." The works that are produced from God's testing will be evidence for or against us at the judgment day. Jesus said, "Behold, I am coming soon! My reward is with me, and I will give to everyone according to what he has done (Revelation 22:12)."
A person is made right with God by faith alone apart from works (Romans 3:28), but a life of perseverance in good works will accord with true faith. This concept directly relates to James's description of true faith in chapter 2. If true faith alone can get one to heaven, and true faith produces a life of good works, then it is proper to say that those who have a life of good works will be rewarded with eternal life. "To those who by persistence in doing good seek glory, honor and immortality, He will give eternal life (Romans 2:7)."
The elect are also benefited by the testing of the heart in judging the genuineness of other's faith. "For no good tree bears bad fruit, nor again does a bad tree bear good fruit, for each tree is known by its own fruit (Luke 6:43,44)." The fruits that are made evident by testing make it possible for a church to judge those within its body (1Cor. 5:12). That visible fruit also makes it meaningful when a body of believers must no longer recognize the salvation of one of its members and thus loose them from their body. “Truly, I say to you, whatever you bind on earth shall be bound in heaven, and whatever you loose on earth shall be loosed in heaven (Matthew 18:18).”

What does it mean to remain steadfast under trials?

Remaining steadfast under trials appears to be the same as going through testing in such a way that gives evidence of a regenerate heart. Remaining steadfast then includes a variety of things, which are necessary for receiving the crown of life (which is eternal life).
To remain steadfast one must not wander from orthodox beliefs. Matthew 10:33 says, “Whoever denies me before men, I also will deny before my Father who is in heaven.” Remaining fast means demonstrating the fruit of the spirit, such as joy. James 1:2 says, “Count it all joy, my brothers, when you meet trials of various kinds.” Those who remain steadfast seek for glory [from God and not from men] and honor [from God and not from men] and immortality by patience in doing good (Romans 2:7-10).
The list could go on. Once again, it is important to remember that faith alone justifies, and one cannot in any way earn his crown of life by demonstrating some valuable quality known as “remaining steadfast”. However, no one who does not remain steadfast has been justified. On the other hand, those who do not remain fast have proven themselves to be false in their faith and thus they fall headlong into destruction.

Why would someone say, “I am being tempted by God”?

James’s audience was quite orthodox in their belief in justification by faith (Ch.2). They were sure that they would receive the crown of life for their belief. However, many were ignorant that true faith is the fruit of a regenerate heart (Ephesians Ch.2). They did not know that their actions were giving away the type of heart they had.
So James as a pastor has said, “Blessed is the man who remains steadfast under trial, for when he has stood the test he will receive the crown of life, which God has promised to those who love him.” Then he remembers that some people might not catch on to this truth, those people he spoke of in verses 5-8 who don’t want wisdom. He knows that when they sin they don’t grow concerned about the state of their heart, but rather they say, “I am being tempted by God.”
These people are going to think, “If God is going to give me eternal life according to my steadfastness then how can He rightly tempt me to sin?”
To which James replies. “God doesn’t send those things to tempt you. He sends those bad things your way to see the fruit of your heart. It is your wicked desires that cause you to sin. Your sin isn’t God’s doing. In fact, God brings forth good things (v.17). If you are man who is full of darkness, how can the Father of Lights bring you forth? He cannot! So you better watch out if you think you’ve got faith. God is going to make it quite clear through trials whether you do or not. Don’t you start trying to be a friend of the world (4:4) or God will prove that your so-called faith is useless (Ch. 2).”