James 1:14-16 But each person is tempted when he is lured and enticed by his own desire. Then desire when it has conceived gives birth to sin, and sin when it is fully grown brings forth death. Do not be deceived, my beloved brothers.
I am preaching on James 1:12-16 tomorrow. I will be addressing the matter of temptation and our need to say "no" to sin. In preparation for any sermon I try to read or scan sermons from various men of God who I particularly admire, one such preacher is Spurgeon. I think God allowed him to be wrong on baptism so he wasn't right on everything.
But seriously (OK, I was serious, but anyways...), check out his very pastoral counsel on how to avoid falling in to sin when tempted:
What settings are you in when you fall? Avoid them.
What props do you have that support your sin? Eliminate them.
What people are you usually with? Avoid them.
There are two equally damning lies Satan wants us to believe:
1) Just once won't hurt.
2) Now that you have ruined your life, you are beyond God's use, and might as well enjoy sinning.