"We need to guard against the first deviation from righteousness; for one transgression, one neglect to manifest the spirit of Christ, opens the way for another and still another, until the mind is overmastered by the principles of the enemy. If cultivated, the spirit of selfishness becomes a devouring passion which nothing but the power of Christ can subdue. 6T 265.1"
"Then when lust hath conceived, it bringeth forth sin: and sin, when it is finished, bringeth forth death."
Both passages describe the progression of sin, starting with a small deviation and leading to greater consequences. James 1:15 focuses on lust leading to sin and death, while EGW speaks of deviation from righteousness leading to being overmastered by the enemy. The core idea of sin's progression is present in both.
"This I say then, Walk in the Spirit, and ye shall not fulfil the lust of the flesh."
Both passages address the importance of resisting temptation and living according to spiritual principles. The EGW passage warns against the cumulative effect of small deviations from righteousness, while Galatians 5:16 encourages walking in the Spirit to avoid fulfilling the desires of the flesh. The EGW passage expands on the principle of resisting temptation.