A man is not strong who takes convulsion-fits; though six men cannot hold him then. He that can walk under the heaviest weight without staggering, he is the strong man.
 Thomas Carlyle, On Heroes, Hero-Worship, and The Heroic in History (1841). copy citation

Context

“there is no good in emitting smoke till you have made it into fire,—which, in the metaphorical sense too, all smoke is capable of becoming! Rousseau has not depth or width, not calm force for difficulty; the first characteristic of true greatness. A fundamental mistake to call vehemence and rigidity strength! A man is not strong who takes convulsion-fits; though six men cannot hold him then. He that can walk under the heaviest weight without staggering, he is the strong man. We need forever, especially in these loud-shrieking days, to remind ourselves of that. A man who cannot hold his peace, till the time come for speaking and acting, is no right man. Poor Rousseau's face is to me expressive of him.” source