Valmiki Ramayana Bala Kanda Sarga 36 Shloka 11

सुरोत्तम O Best among gods, तव your, तेज: energy, लोका: worlds, न धारयिष्यन्ति cannot contain, ब्राह्मेण in conformity vedas, तपसा by yogic penance, युक्त: endowed with, देव्या सह in the company with Parvati, तप: austerities, चर engage yourself, त्रैलोक्यहितकामार्थम् with the intention of doing welfare for three worlds, तेज: energy, तेजसि in your energy, धारय retain.

"O best among the gods, the worlds cannot contain your energy (the son born of your energy) You may engage yourself in penance in the company of Uma in conformity with the Vedas. Retain your energy in your body for the welfare of the three worlds."