A liar is always lavish of oaths. [Fr., Un menteur est toujours prodigue de serments.]

A good memory is needed once we have lied. [Fr., Il faut bonne memoire apres qu'on a menti.]

One ought to have a good memory when he has told a lie.

Flee an enemy who knows your weakness.

He who forgives readily only invites offense.

A good memory is needed after one has lied.