mistake

A fox is not taken twice in the same snare.

it means

Confess ang be hanged

suggests that

He is lifeless that is faultless.

means that

He who makes no mistakes, makes nothing.

in other words

A stumble may prevent a fall.

said to mean that

Fool me once, shame on you; fool me twice, shame on me.

said to mean that

Even Homer sometimes nods

states that

Homer sometimes nods

states that