In college, I heard a sermon on the story of the sin that Achan committed. It stuck with me. Achan sinned against the word of God.
Joshua 7:21 When I saw among the spoils a goodly Babylonish garment, and two hundred shekels of silver, and a wedge of gold of fifty shekels weight, then I coveted them, and took them; and, behold, they are hid in the earth in the midst of my tent, and the silver under it.
He saw, coveted, took, then hid the accursed thing. How often do we do this in our lives? We look where we shouldn't, then covet what we shouldn't, then we go ahead and partake of it thinking nothing will happen, then we hide it thinking no one will find it. God knows it all. We can not hide our sin from God. We can not cover it up. Sin does not only affect us, but those around us.
Joshua 7: 24 And Joshua, and all Israel with him, took Achan the son of Zerah, and the silver, and the garment, and the wedge of gold, and his sons, and his daughters, and his oxen, and his asses, and his sheep, and his tent, and all that he had: and they brought them unto the valley of Achor.
25 And Joshua said, Why hast thou troubled us? the LORD shall trouble thee this day. And all Israel stoned him with stones, and burned them with fire, after they had stoned them with stones.
Satan lies to us about our sin. It will be found out, whether it be today, tomorrow, or some time down the road. We need to guard our lives. When you are looking at the wrong things, you think the wrong things, and then you act upon those feelings.
I John 2:16
For all that is in the world, the lust of the flesh, and the lust of the eyes, and the pride of life, is not of the Father, but is of the world.
Galatians 5: 16
This I say then, Walk in the Spirit, and ye shall not fulfil the lust of the flesh.