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“To me it seems that those sciences are vain and full of error which are not born of experience, mother of all certainty, firsthand experience which in its origins, or means, or end has passed through one of the five senses. And if we doubt the certainty of everything which passes through the senses, how much more ought we to doubt things contrary to these senses such as the existence of god or of the soul or similar things over which there is always dispute and contention,”
― Leonardo Da Vinci

“Ludwig Boltzmann, who spent much of his life studying statistical mechanics, died in 1906, by his own hand. Paul Ehrenfest, carrying on the work, died similarly in 1933. Now it is our turn to study statistical mechanics.”
― David L. Goodstein, States of Matter

“Don't resist when life needs to remove the "old" to make room for the the "new." The pain you're feeling isn't caused by letting things or people go, what's actually hurting you is swimming exhaustively against the natural flow that was intended to carry you.

What's truly meant for you shouldn't feel forced, and your blessings are definitely on the way. So stop clinging to whatever needs to be purged... focus instead on freeing yourself to receive. What God has for you, is meant just for you... you'll never have to fight or compete with anyone for what's been divinely designated as yours.”
― Kianu Starr

“Soon earth will cover us all. Then in time earth, too, will change; later, what issues from this change will itself in turn incessantly change, and so again will all that then takes its place, even unto the world's end. to let the mind dwell on these swiftly rolling billows of change and transformation is to know a contempt for all things mortal.”
― Marcus Aurelius, Meditations