It is helpful to know our boundaries, so that we do not spend our efforts in attempting things that cannot be accomplished.

God's eternal purpose cannot be overthrown (Acts 5:39)

One cannot bear good fruit without Christ (John 15:5)

No person can keep his sins hidden forever (I Timothy 5:24)

No person can live after the flesh and please God (Romans 8:8)

A person cannot love God and not love his brother in Christ (I John 4:20)

A person cannot serve two masters (Mathew 6:24)

No one can take anything out of this world (I Timothy 6:7)

After dying lost, one cannot be saved (Luke 16:26)

One cannot make God be a liar (Romans 3:4)

One cannot enter into heaven by any door but Christ (John 10:1-9)

One cannot enter in after the door is closed (Luke 13:25-27)

One cannot avoid reaping what he has sown (Galatians 6:7-8)

One cannot be justified by the law of Moses ( Galatians 3:11; 5:4)

One cannot be saved by animal sacrifices (Hebrews 9:22; 10:4-12)

Man cannot escape death or the judgment (Hebrews 9:27)

A Christian who is faithful till death cannot lose his reward (Matthew 10:42;
I Corinthians 15:58)