Memory and Imagination

For the enemy hath persecuted my soul: he hath brought down my life to the earth. He hath made me to dwell in darkness as those that have been dead of old:
And my spirit is in anguish within me: my heart within me is troubled.
I remembered the days of old, I meditated on all thy works: I meditated upon the works of thy hands.

Now to remember the future is not possible, but this is an object of opinion or expectation (and indeed there might be actually a science of expectation, like that of divination, in which some believe); nor is there memory of the present, but only sense-perception. For by the latter we know not the future, nor the past, but the present only. But memory relates to the past. No one would say that he remembers the present, when it is present, e.g. a given white object at the moment when he sees it; nor would one say that he remembers an object of scientific contemplation at the moment when he is actually contemplating it, and has it full before his mind;-of the former he would say only that he perceives it, of the latter only that he knows it.

When to the sessions of sweet silent thought,
I summon up remembrance of things past,
I sigh the lack of many a thing I sought,
And with old woes new wail my dear time’s waste:
Then can I drown an eye (unused to flow)
For precious friends hid in death’s dateless night,
And weep afresh love’s long since cancelled woe,
And moan th’ expense of many a vanished sight.
Then can I grieve at grievances foregone,
And heavily from woe to woe tell o’er
The sad account of fore-bemoaned moan,
Which I new pay as if not paid before.
But if the while I think on thee (dear friend)
All losses are restored, and sorrows end.