Please subdue the anguish of your soul. Nobody is destined only to happiness or to pain. The wheel of life takes one up and down by turn.
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Kalidasa
To be happy is always difficult to achieve. That is to say, happiness and sorrow alternate in one’s life and there cannot be uninterrupted happiness alone
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Valmiki
Do not let your difficulties fill you with anxiety, after all it is only in the darkest nights that stars shine more brightly.
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Ali ibn Abi Talib
one for you and one against you, so when it's for you don't be proud or reckless, and when it's against you be patient, for both days are test for you
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Ali ibn Abi Talib
True happiness is to enjoy the present, without anxious dependence upon the future.
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Seneca
There is no knowledge so hard to acquire as the knowledge of how to live this life well and naturally.
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Montaigne
He is a wise man who does not grieve for the things which he has not, but rejoices for those which he has.
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Epictetus