TCR 676 - washing your heart

Matthew 18: 16-20
"Are you still so dull?" Jesus asked them.
"Don't you see that whatever enters the mouth
goes into the stomach and then out of the body?
But the things that come out of the mouth come from the heart,
and these make a man 'unclean.'
For out of the heart come evil thoughts, murder, adultery,
sexual immorality, theft, false testimony, slander.
These are what make a man 'unclean'.

TCR 676
The external person is not a person,
but only the figure of a person;
for it is the internal,
the power to be wise which comes from God,
which makes the person.
It is much the same with the circumcised and the baptized,
unless each circumcises or washes his heart.