widiyabuana

“Concentration "without" is illustrated when you devote all your attention upon Nature, such as learning a trade, a profession, a science, an art or some form of business. This is Evolution, outgoing or positive mental energy. I shall call this Objective Concentration. Concentration "within" implies the withdrawing of attention from the external world and the placing of mind on "God," "Spirit," "Heaven," "Religion," "Peace," "Nirvana," "Eternity," etc. This is Involution, i.e., incoming or negative energy.”
― A. P. Mukerji, The Doctrine and Practice of Yoga Including the Practices and Exercises of Concentration, both Objective and Subjective, and Active and Passive Mentation, ... Terrible, also the Mystery of Will-Force