What is a sin?
Sin means means transgression of the law or instructions of God.Christians are busy fighting the sin of flesh which is easy to defeat but there is another nature of sin that is meek and so dangerous to our souls.Jesus said "But now I tell you,anyone who looks at a woman and wants to possess her is guilty of committing adultery with her in his heart" Mtt5:28.That is lust a sin of spirit.Men,how many girls have you admired to sleep with?I bet you have lusted after many hot girls you see on the media,the sin of spirit is quiet and not punishable by human laws.Only God can punish sins of lust,hatred,enmity and these are responsible for occurence of flesh sins of rape,fornication,murder.The flesh is always against the spirit and both have different sins so put to death all desires of flesh,live by the Spirit(Galatians5:24).The sin of spirit like lust is from sight hence make your eyes dead to sight that is sensitive to sexual feelings lest lust is not initiated.
The flesh demands but control it.