Letters 63.8

Let us greedily enjoy our friends, because we do not know how long this privilege will be ours. Let us think how often we shall leave them when we go upon distant journeys, and how often we shall fail to see them when we tarry together in the same place; we shall thus understand that we have lost too much of their time while they were alive.

Seneca, Letters to Lucilius 63.8, translated by Richard Mott Gummere