Success is never final. Failure is never fatal

सुखस्यानन्तरं दुःखम्
दुःखस्यानन्तरं सुखम् ।
न नित्यं लभते दुःखम्
न नित्यं लभते सुखम् ॥

Bad days follow good times and similarly, happy days always follow the miserable ones. Everyday can never be a bad day, nor can one derive happiness everyday.

Success is never final.
Failure is never fatal.
After a storm comes a calm.
Nothing lasts forever, not even your troubles.