(Sanskrit वीर्या) Also spelled virya. Literally, "vitality, virility, power, efficacy, courage, bravery, strength, valour, manly vigour, heroism, splendour, dignity, lustre, robustness, semen virile, consequence, heroic deed, manliness"
"Mind, Prana, and Veerya [sexual energy] are one. By controlling the mind, you can control Prana and semen. By controlling Prana you can control the mind and semen. By controlling semen, you can control the mind and Prana. …if the Veerya is controlled, and if it is made to flow upwards into the brain by pure thoughts and the practice of… Pranayama, the mind and the Prana are automatically controlled... If the Veerya is lost [through orgasm], Prana gets unsteady. Prana is agitated. The man becomes nervous. Then the mind also cannot work properly. The man becomes fickle-minded. There is mental weakness. If the Prana is rendered steady, the mind also becomes steady. If the Veerya is steady, the mind also is steady. If the Veerya is steady, the mind also is steady. If the Drishti or vision is steady, the mind also becomes steady. Therefore, control the Prana, the Veerya and the Drishti. The Lord says in the Gita: "Paurusham Nrishu. I am the seed or virility in men". Veerya is the essence of life, thought, intelligence and consciousness. Therefore, preserve this vital fluid very, very carefully, my dear readers! ... Just as the oil comes up in a wick and burns with glowing light, so also, the Veerya or semen flows up by the practice of Yoga Sadhana and is converted into Tejas or Ojas. The Brahmachari shines with Brahmic aura in his face. Brahmacharya is the bright light that shines in the house of the human body. It is the blossomed flower of life around which the bees of strength, patience, knowledge, purity and Dhriti wander about humming hither and thither. In other words, he who observes Brahmacharya will be endowed with the above qualities.” —Swami Sivananda