It's all now you see: tomorrow began yesterday and yesterday won't be over until tomorrow.

Yesterday’s the past, tomorrow’s the future, but today is a gift. That’s why it’s called the present.

Remember, today is the tomorrow you worried about yesterday.

One world and then another, running like a chain. One world treading on the heels of another world that plodded just ahead. One world’s tomorrow, another world’s today. And yesterday is tomorrow and tomorrow is the past. Except, there wasn’t any past. No past, that was, except the figment of remembrance that flitted like a night-winged thing in the shadow of one’s mind. No past that one could reach. No pictures painted on the wall of time. No film that one could run backward and see what-once-had-been.

The future you have, tomorrow, won't be the same future you had, yesterday.

Yesterday is safe,
Tomorrow's full of danger,
Yesterday's a face I know,
Tomorrow is a stranger.

Every today is at the same time both a cradle and a shroud: a shroud for yesterday, a cradle for tomorrow. Today, yesterday, and tomorrow are equally near to one another, and equally far. They are generations, they are grandfathers, fathers, and grandsons. And grandsons invariably love and hate the fathers; the fathers invariably hate and love the grandfathers. Today is doomed to die — because yesterday died, and because tomorrow will be born. Such is the wise and cruel law. Cruel, because it condemns to eternal dissatisfaction those who already today see the distant peaks of tomorrow; wise, because eternal dissatisfaction is the only pledge of eternal movement forward, eternal creation. He who has found his ideal today is, like Lot's wife, already turned to a pillar of salt, has already sunk into the earth and does not move ahead. The world is kept alive only by heretics: the heretic Christ, the heretic Copernicus, the heretic Tolstoy. Our symbol of faith is heresy: tomorrow is an inevitable heresy of today, which has turned into a pillar of salt, and to yesterday, which has scattered to dust. Today denies yesterday, but is a denial of denial tomorrow. This is the constant dialectic path which in a grandiose parabola sweeps the world into infinity. Yesterday, the thesis; today, the antithesis, and tomorrow, the synthesis.

Touch a button and hear, at every level of your life, the iron doors shutting out the Past the dead yesterdays. Touch another and shut off, with a metal curtain, the Future the unborn tomorrows. Then you are safe, safe for today! Shut off the past! Let the dead past bury its dead. Shut out the yesterdays which have lighted fools the way to dusty death. The load of tomorrow, added to that of yesterday, carried today, makes the strongest falter. Shut off the future as tightly as the past. The future is today. There is no tomorrow. The day of man's salvation is now. Waste of energy, mental distress, nervous worries dog the steps of a man who is anxious about the future. Shut close, then the great fore and aft bulkheads, and prepare to cultivate the habit of life of 'day-tight compartments.

The future will be better tomorrow

I am in yesterday, today. And tomorrow? In tomorrow I was.

We usually lost today because there has been a yesterday, and tomorrow is coming.

they think about Tomorrow, that is to say, simply, a new today;

When you are in the future, the past looks different.

Yesterday's just a memory; tomorrow's never what it's supposed to be.