MENTAL ENERGY • E-FREE TRANSLATION.COM • Definition of Mental energy

... a sign of foreign travel, the making of many friends, and much mental energy; sometimes it gives a hint that there is an inclination ...

— Telling Fortunes By Tea Leaves • Cicely Kent

... it so. Let it even be admitted that egoism is the only power conceivable by a modern metaphysician to be the spring of mental energy; just as chemical excitement may be the only power traceable by the modern physician as the source of muscular energy. And still Mr. Spencer's subsequent analysis is inaccurate, and unscholarly. For egoism does not necessarily imply either misapprehension or mismeasurement. There are ...

— On the Old Road, Vol. 2 (of 2) - A Collection of Miscellaneous Essays and Articles on Art and Literature • John Ruskin