James describes a sequence: desire conceives and gives birth to sin, and sin when fully grown brings forth death (James 1:14–15). The focus is on an internal progression leading to outward outcome.
James 1:12–18 contrasts two “sources” for human testing and action. The person who keeps going through James 1:12 is called blessed and is promised “the crown of life.” But when someone is being tempted toward evil, they must not blame God: God neither responds to evil temptation nor tempts anyone. This unit continues James’s opening emphasis on trials and endurance (earlier in chapter 1), but it narrows the focus: not every “trial” is the same as being pulled toward evil.
James 1:12–18 draws a sharp line between testing that must be endured and temptation toward evil that must not be blamed on God. The passage explicitly says the person who endures is “blessed” and will receive “the crown of life,” promised “to those who love the Lord” (James 1:12).
A careful answer keeps the immediate passage, the book's argument, and the whole-Bible storyline together, so the question is answered in context instead of as a detached idea.
Start with James 1:14-15, then read the surrounding section so the answer stays connected to the passage's flow.
14But each one is tempted, when he is drawn away by his own lust, and enticed.
15Then the lust, when it has conceived, bears sin; and the sin, when it is full grown, brings forth death.