ब्रह्मचर्यप्रतिष्ठायां वीर्यलाभः ॥३८॥
38. By the establishment of continence energy is gained.
The chaste brain has tremendous energy and gigantic will-power. Without chastity there can be no spiritual strength. Continence gives wonderful control over mankind. The spiritual leaders of men have been very continent, and this is what gave them power. Therefore the Yogi must be continent.
- Swami Vivekanadna
The Complete Works of Swami Vivekananda/Volume 1/Raja-Yoga/Patanjali's Yoga Aphorisms - Concentration: Its Practice