A passage from Seneca
Seneca, On the Happy Life 5.1
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Pleasure is not the good, but the good is not without pleasure. The wise man will enjoy pleasures when they come, but he will not seek them as the end of life.
Related passages
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At dawn, when you have trouble getting out of bed, tell yourself: 'I have to go to work — as a human being.'
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Take care not to be Caesarified, or dyed with purple; for it does happen. Keep thyself then simple, good, pure, serious, free from affectation.
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It is a man's special privilege to love even those who wrong him.