सुखक्षये प्राप्ते पुमानुग्रं तपश्चरेत्

When happiness is lost, man should undertake “Tapa”

This statement is an advice by Rishi Parashara to King Janaka , which is mentioned as part of Parashara Gita in Mahabharata, Shanti Parva chapter 295 verse 26

“सुखक्षये प्राप्ते पुमानुग्रं तपश्चरेत्” means when the happiness goes away, man should undertake greatest “Tapa”

Sanskrit Shola

नष्टप्रज्ञो यदा भवति तदा न्यायं न पश्यति ।
तस्मात्सुखक्षये प्राप्ते पुमानुग्रं तपश्चरेत् ॥२६॥

English Meaning

When a person loses his wisdom, he no longer perceive what is right or wrong. Therefore, when happiness goes away, he should undertake greatest tapa.