They whose activity of ...

They whose activity of imagination is often shifting the scenes of expectation, are frequently subject to such sallies of caprice as make all their actions fortuitous, destroy the value of their friendship, obstruct the efficacy of their virtues, and set them below the meanest of those who persist in their resolutions, execute what they design, and perform what they have promised.
They whose activity of imagination is often shifting the scenes of expectation, are frequently subject to such sallies of caprice as make all their actions fortuitous, destroy the value of their friendship, obstruct the efficacy of their virtues, and set them below the meanest of those who persist in their resolutions, execute what they design, and perform what they have promised.

Quotes from the same author

If a man does not make new acquaintances as he advances through life, he will soon find himself left alone. A man, sir, should keep his friendship in a constant repair.
To keep your secret is wisdom; but to expect others to keep it is folly.
Love is the wisdom of the fool and the folly of the wise.
Memory is the mother of all wisdom.
Friendship, like love, is destroyed by long absence, though it may be increased by short intermissions.