मनुस्मृति - तपः

तयोर्नित्यं प्रियं कुर्यात् आचार्यस्य च सर्वदा ।
तेष्वेव त्रिषु तुष्टेषु तपः सर्वं समाप्यते ॥

- मनुस्मृति

One must do all he can to keep his parents and teacher happy. If they are satisfied it is equivalent to any (all) penance.

- Manu Smriti