According to traditional Christian belief, the author of the Book of James is believed to be James, the brother of Jesus. He was a prominent leader in the early Christian church in Jerusalem and was known for his wisdom, piety, and humble spirit.

In James 3:17-18, he writes about the qualities of true wisdom that come from God. He emphasizes the importance of wisdom that is pure, peaceable, gentle, open to reason, full of mercy and good fruits, impartial and sincere. James encourages believers to strive for this type of wisdom, which will result in a harvest of righteousness and peace.

Evangelical Christians hold the Book of James in high regard for its practical teachings on living out the Christian faith in daily life. They see the author as an example of someone who lived out his faith with integrity and humility, and they strive to emulate his example in their own lives.