The flesh fight with the Holy Spirit so we don’t do the things that we should do.

Walk in the Spirit, and you will not give in to the flesh.

Galatians 5:16-17 (KJV) – this I say then, Walk in the Spirit, and ye shall not fulfil the lust of the flesh. 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.