Iron rusts from disuse; water loses its purity from stagnation... even so does inaction sap the vigor of the mind.
If you're throwing punches or exerting energy but you're not breathing, you're holding your breath. That actually saps your strength, it saps your stamina.
Ring out the grief that saps the mind, for those that were here we see no more.
Boredom dismantles the mind, renders it superficial, out at the seams, saps it from within and dislocates it.
Knowledge is not a passion from without the mind, but an active exertion of the inward strength, vigor and power of the mind, displaying itself from within.
Bodily vigor is good, and vigor of intellect is even better, but far above is character.
Inaction is cowardice, but there can be no scholar without the heroic mind.
I am now in the full maturity of my age and vigor of my mind. Persons of various descriptions have repeatedly solicited me to turn my mind to dramatical composition. It was, indeed, the first amusement of my thoughts in my school-boy cell.
It is exercise alone that supports the spirits, and keeps the mind in vigor.
Reflection increases the vigor of the mind, as exercise does the strength of the body.
As every divided kingdom falls, so every mind divided between many studies confounds and saps itself.
Inaction that results from indulgence is Procrastination. Inaction that results from intention is Patience.
The health and vigor necessary for the practice of what is good, depend equally on both mind and body.
Of course Mahatma Gandhi you might say did not have so much physical vigor but he certainly seemed to have extraordinary resistance, which perhaps is rather different from physical vigor.
Perfect freedom is as necessary to the health and vigor of commerce as it is to the health and vigor of citizenship.
Years steal fire from the mind as vigor from the limb; and life's enchanted cup but sparkles near the brim.