anima animating force atman bathmism beating heart biological clock biorhythm blood breath breath of life divine breath divine spark elan vital essence of life force of life growth force heart heartbeat heartblood impulse of life inspiriting force jiva jivatma life breath life cycle life essence life principle life process lifeblood living force pneuma prana seat of life soul spark of life spirit vis vitae vis vitalis vital energy vital flame vital fluid vital force vital principle vital spark vital spirit