Seneca

Life is divided into three periods, past, present and future. Of these, the present is short, the future is doubtful, the past is certain.

life, if you know how to use it, is long.

It takes the whole of life to learn

it takes the whole of life to learn how to die

so there is no reason for you to think that any man has lived long because he has grey hairs or wrinkles; he has not lived long—he has existed long.

ld age surprises them while their minds are still childish, and they come to it unprepared and unarmed, for they have made no provision for it;

Old age surprises them while their minds are still childish, and they come to it unprepared and unarmed, for they have made no provision for it;

People are frugal in guarding their personal property; but as soon as it comes to squandering time they are most wasteful of the one thing in which it is right to be stingy

You are living as if destined to live for ever; your own frailty never occurs to you; you don’t notice how much time has already passed, but squander it as though you had a full and overflowing supply – though all the while that very day which you are devoting to somebody or something may be your last

Aren’t you ashamed to keep for yourself just the remnants of your life, and to devote to wisdom only that time which cannot be spent on any business?