A passage from Cicero
Cicero, Tusculan Disputations 3.13
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There is nothing that fear or grief may not extort from a soul which is not fortified by philosophy.
Related passages
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Of human life the time is a point, the substance flowing, the perception dull... The only thing that escorts a man on his way is philosophy.
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Do not disturb thyself by thinking of the whole of thy life. Let not thy thoughts at once embrace all the various troubles which thou mayest expect to befall thee.
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Whatever this is that I am, it is a little flesh and breath, and the ruling part. Throw away thy books; no longer distract thyself: it is not allowed.