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You can't have a better tomorrow if you are thinking about yesterday all the time.

 

Charles Kettering

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Fear is always in relation to something; it does not exist by itself. There is fear of what happened yesterday in relation to the possibility of its repetition tomorrow; there is always a fixed point from which relationship takes place. How does fear come into this? I had pain yesterday; there is the memory of it and I do not want it again tomorrow. Thinking about the pain of yesterday, thinking which involves the memory of yesterday’s pain, projects the fear of having pain again tomorrow. So it is thought that brings about fear. Thought breeds fear; thought also cultivates pleasure. To understand fear you must also understand pleasure — they are interrelated; without understanding one you cannot understand the other. This means that one cannot say ‘I must only have pleasure and no fear’; fear is the other side of the coin which is called pleasure. Thinking with the images of yesterday’s pleasure, thought imagines that you may not have that pleasure tomorrow; so thought engenders fear. Thought tries to sustain pleasure and thereby nourishes fear. Thought has separated itself as the analyzer and the thing to be analyzed; they are both parts of thought playing tricks upon itself. In doing all this it is refusing to examine the unconscious fears; it brings in time as a means of escaping fear and yet at the same time sustains fear.

 

Jiddu Krishnamurti

 

To worry about tomorrow is to detract from your work today. Time you spend thinking about tomorrow is time you're not spending thinking about what to do today. The place you leave in the code because you think you'll need it tomorrow, is actually a waste of time today — and a liability tomorrow. It does more harm than good.

 

Ward Cunningham

 

Anyone can fight the battles of just one day. It is only when you and I add the battles of those two awful eternities, yesterday and tomorrow, that we break down. It is not the experience of today that drives us mad. It is the remorse or bitterness for something that happened yesterday or the dread of what tomorrow may bring. Let us therefore do our best to live but one day at a time.

 

Richmond Walker

 

There was no time, Hezekiah had said. No such thing as time in the terms of normal human thought. Time was bracketed and each of its brackets contained a single phase of a universe so vastly beyond human comprehension that it brought a man up short against the impossibility of envisioning it.
And time itself? Time was a never-ending medium that stretched into the future and the past — except there was no future and no past, but an infinite number of brackets, extending either way, each bracket enclosing its single phase of the Universe.
Back on Man's original Earth, there had been speculation on travelling in time, of going back into yesterday or forward into tomorrow. And now he knew that you could not do it, that the same instant of time remained forever within each bracket, that Man's Earth had ridden the same bubble of the single instant from the time of its genesis and that it would die and come to nothing within that self-same instant.
You could travel in time, of course, but there would be no yesterday and no tomorrow. But if you held a certain time sense you could break from one bracket to another, and when you did you would not find yesterday or tomorrow, but another world.

 

Clifford D. Simak

 

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

 

Henry Summers