Speak no evil of an absent friend. (Non male loquare absenti amico.)
–Plautus

Seldom seen, soon forgotten.
–Richard Hilles

The pain without the peace of death.
–Plautus, on absence

The absent are as good as dead.
–Latin Proverb

The absent and the dead have no friends.
–Spanish Proverb

Absence makes the heart go wander.
–Unknown