Matthew 18:8-9
If your hand or your foot becomes the occasion for you falling away [from God], cut them off and throw them away. It would be better for you to enter [never ending] life disabled or crippled, rather than keeping both hands and both feet and being thrown into the never ending fire [i.e., because they caused you to fall away from God].
1 Corinthians 9:27
But I work out and get my body in shape [i.e., spiritually], so that after preaching to other people, I myself do not become disqualified [i.e., for winning the prize from God. See verse 24].
Philippians 3:19
Their [ultimate] end is [spiritual] destruction; their god is their appetite; they boast of what they ought to be ashamed of, and they [constantly] think about worldly things.