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“If a man will begin with certainties, he shall end in doubts; but if he will be content to begin with doubts, he shall end in certainties.”
― Francis Bacon, The Oxford Francis Bacon IV: The Advancement of Learning

“Perhaps my best years are gone. When there was a chance of happiness. But I wouldn't want them back. Not with the fire in me now. No, I wouldn't want them back.”
― Samuel Beckett, Krapp's Last Tape & Embers

“The Road goes ever on and on
Down from the door where it began.
Now far ahead the Road has gone,
And I must follow, if I can,
Pursuing it with eager feet,
Until it joins some larger way
Where many paths and errands meet.
And whither then? I cannot say”
― J.R.R. Tolkien, The Fellowship of the Ring