2 Corinthians 13:5
Put yourselves to the proof, to see whether you are holding to the Faith. Test yourselves. Surely you recognize this fact about yourselves--that Jesus Christ is in you! Unless indeed you cannot stand the test!
Acts 26:20
On the contrary, first to those at Damascus and Jerusalem, and then through the whole of Judea, and to the Gentiles as well, I began to preach repentance and conversion to God, and a life befitting that repentance.
1 Corinthians 11:28
Let each man look into his own heart, and only then eat of the bread and drink from the cup.
1 Corinthians 11:31
But, if we judged ourselves rightly, we should not be judged.