Sign of Strength

..capacity to remain still when one wants to, to gather all one’s energies and spend them as one wishes, completely if one wants, or to apportion them as one wants in action, with a perfect calm even in action—that is always the sign of strength. It may be physical strength or vital strength or mental strength. But if you are in the least agitated, you may be sure there is a weakness somewhere; and if your restlessness is integral, it is an integral weakness.

Ref : Questions and Answers 1956