History is a sequence of random events and unpredictable choices, which is why the future is so difficult to foresee.

We do not know enough about how the present will lead into the future. We shall never be able to say, "Ha! My perception, my accounting for that series, will indeed cover its next and future components," or "Next time I meet with these phenomena, I shall be able to predict their total course.

The uncertainty of the future is inescapable, one must think about it and arrive at plans for action. A statement attributed to a number of thinkers is, "Prediction is very difficult, especially of the future." Postdiction, knowing what went on in the past, is also difficult. The past, however, is our basis for understanding the future.

It is impossible to foretell the future with any degree of accuracy, that it is impossible to rehearse life. A fault in the scenery, a face in the audience, an interruption of the audience on to the stage, and all our carefully planned gesture mean nothing, or mean too much.

Prediction is very difficult, especially about the future.

...some events in life would remain beyond my ability to control or manage them. Some events would just happen.

We can never know what might have been but what is to come is another matter entirely

“Prediction is very difficult, especially about the future”.

What happens in our future can change the meaning of what has happened in our past.

By being unknowable, by resulting from events which, at the sub-atomic level, cannot be fully predicted, the future remains malleable, and retains the possibility of change, the hope of coming to prevail; victory, to use an unfashionable word. In this, the future is a game; time is one of the rules.

REMEMBER: it is impossible to evaluate, or even understand, anything that you cannot measure.” 80

...[I]t is simply impossible to predict the effects of lifetime exposure to chemical and physical agents that are not part of the biological experience of man.

It is not easy to be wise for all times, not event for the present much less for the future; and those who judge the past must recollect that, when it was the present the present was future

It’s tough to make predictions, especially about the future.