Patanjali's yoga sutras

ब्रह्मचर्यप्रतिष्ठायां वीर्यलाभः ॥ २.३८ ॥

brahmacaryapratiṣṭhāyāṃ vīryalābhaḥ || 2.38 ||

brahmacarya—of Brahmacarya; continence, pratiṣṭhāyām—in the confirmation. vīrya—vigour, lābbaḥ—gaining; obtaining.

38. Continence being confirmed, vigour is obtained.