Marcus Aurelius

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• The happiness of your life depends upon the quality of your thoughts.

Seneca

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• People are frugal in guarding their personal property; but as soon as it comes to squandering time they are most wasteful of the one thing in which it is right to be stingy.
• He who spares the wicked injures the good.

Zeno

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• No loss should be more regrettable to us than losing our time, for it’s irretrievable.