Galatians 5:17
17 For the flesh lusteth against the Spirit, and the Spirit against the flesh: and these are contrary the one to the other: so that ye cannot do the things that ye would.
Everyday there is a war that rages in each of us. The flesh craves the world, and the spirit will crave God. That war never ends until the day we close our eyes in death. The question is, which part of you is the strongest? Is your spirit stronger than your flesh or will you give into the desires of the world? If your spirit cannot overcome your flesh, then you need to pray and strengthen the spirit. The spirit has to be stronger than the flesh. It has to be close enough to God that when the flesh tries and make you pursue the things of to God that the spirit can overcome it. This battle will get easier the closer to God you are. Always make sure that you stay close enough to God that the flesh and its lusts never win.