All that a man does is physiognomical of him. You may see how a man would fight, by the way in which he sings; his courage, or want of courage, is visible in the word he utters, in the opinion he has formed, no less than in the stroke he strikes. He is one; and preaches the same Self abroad in all these ways.
Without hands a man might have feet, and could still walk
 Thomas Carlyle, On Heroes, Hero-Worship, and The Heroic in History (1841). copy citation

Context

“that what we call imagination, fancy, understanding, and so forth, are but different figures of the same Power of Insight, all indissolubly connected with each other, physiognomically related; that if we knew one of them, we might know all of them. Morality itself, what we call the moral quality of a man, what is this but another side of the one vital Force whereby he is and works? All that a man does is physiognomical of him. You may see how a man would fight, by the way in which he sings; his courage, or want of courage, is visible in the word he utters, in the opinion he has formed, no less than in the stroke he strikes. He is one; and preaches the same Self abroad in all these ways. Without hands a man might have feet, and could still walk: but, consider it,—without morality, intellect were impossible for him; a thoroughly immoral man could not know anything at all! To know a thing, what we can call knowing, a man must first love the thing, sympathize with it:” source