“Then when lust hath conceived, it bringeth forth sin: and sin, when it is finished, bringeth forth death.”
King James Version (KJV)
1:15 Then desire having conceived - By our own will joining therewith. Bringeth forth actual sin - It doth not follow that the desire itself is not sin. He that begets a man is himself a man. And sin being perfected - Grown up to maturity, which it quickly does. Bringeth forth death - Sin is born big with death.
Jas 1:15 When lust hath conceived, it bringeth forth sin. The course of sin is described as that of a birth. The sinful desire is the conception; the sinful deed, the birth; moral and eternal death, the final result.