He forgets himself.
More Latin Proverbs:
Fight with silver spears, and you will overcome everything.Latin
Sorrow follows pleasure.
Latin
You compare the bee to the grasshopper!
Latin
To understand a stammerer, you ought to stammer yourself.
Latin
He fishes in troubled waters. [If you wish to catch gudgeons stir up the mud.]
Latin
Tide and time wait for no man.
Latin