Time present and time past
Are both perhaps present in time future
And time future contained in time past.
If all time is eternally present
All time is unredeemable.
What might have been is an abstraction
Remaining a perpetual possibility
Only in a world of speculation.
What might have been and what has been
Point to one end, which is always present.

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

The world that we think we see
is only our best guess.

Fantasy flows in where fact leaves a vacuum.

All descriptions of reality are temporary hypotheses.

By the sole fact of being accomplished, reality casts its shadow behind it into the indefinitely distant past: it thus seems to have been pre-existent to its own realization, in the form of a possible. From this results an error which vitiates our conception of the past; from this arises our claim to anticipate the future on every occasion

We only have now! Everything else is either imagination or memory.

In a world of diminishing mystery, the unknown persists.

Everything is only a dream.

All that is transitory is but a metaphor.

I think that only daring speculation can lead us further and not accumulation of facts.

Every object, the old man had said, is but an interpretation of every other object. There is no sure knowledge, only endless process.

Once you began speculation about that, once you admited to yourself that you didn't really know how another person's mind operated, then you came up against the ultimate admission — anything was possible.

Almost every reality you "know" at any given second is a mere ghost held in memory.