“Physical strength is measured by what we carry.
Inner strength is measured by what we can bear.”
Related quotes

in his memoirs, as quoted by [Jean Matricon, G. Waysand, Charles Glashausser, The cold wars: a history of superconductivity, Rutgers University Press, 2003, 0813532957, 18]

Source: Anarcho-Syndicalism (1938), Ch. 5 "The Methods of Anarcho-Syndicalism"
Context: Political rights do not exist because they have been legally set down on a piece of paper, but only when they have become the ingrown habit of a people, and when any attempt to impair them will meet with the violent resistance of the populace. Where this is not the case, there is no help in any parliamentary Opposition or any Platonic appeals to the constitution. One compels respect from others when he knows how to defend his dignity as a human being. This is not only true in private life, it has always been the same in political life as well.
The peoples owe all the political rights and privileges which we enjoy today in greater or lesser measure, not to the good will of their governments, but to their own strength.

Source: The Emperor's New Mind (1989), Ch. 6, Quantum Magic and Quantum Mastery, p. 269.
Context: It seems to me that we must make a distinction between what is "objective" and what is "measurable" in discussing the question of physical reality, according to quantum mechanics. The state-vector of a system is, indeed, not measurable, in the sense that one cannot ascertain, by experiments performed on the system, precisely (up to proportionality) what the state is; but the state-vector does seem to be (again up to proportionality) a completely objective property of the system, being completely characterized by the results it must give to experiments that one might perform.

“Courage, strength and value of a person are measured by the ability to face up difficulties.”
Original: (it) Coraggio, forza e valore di una persona si misurano dalla capacità di affrontare le difficoltà.
Source: prevale.net

"Matteo" in Concerning the New Star (1606)
Other quotes

“It is we who are the measure of what is strange and miraculous”
A 26
Aphorisms (1765-1799), Notebook A (1765-1770)
Context: It is we who are the measure of what is strange and miraculous: if we sought a universal measure the strange and miraculous would not occur and all things would be equal.

Bhawani Mandir, 1905
India's Rebirth

“It is not easy to measure the ocean, but we can be measured by it, confront it, and be in it.”
Source: The Archaic Revival