The man whom Nature has appointed to do great things is, first of all, furnished with that openness to Nature which renders him incapable of being insincere! To his large, open, deep-feeling heart Nature is a Fact: all hearsay is hearsay
 Thomas Carlyle, On Heroes, Hero-Worship, and The Heroic in History (1841). copy citation

Context

“as he calls himself, trying hard to get some honest livelihood in the world, not to starve, but to live—without stealing! A noble unconsciousness is in him. He does not "engrave Truth on his watch-seal;" no, but he stands by truth, speaks by it, works and lives by it. Thus it ever is. Think of it once more. The man whom Nature has appointed to do great things is, first of all, furnished with that openness to Nature which renders him incapable of being insincere! To his large, open, deep-feeling heart Nature is a Fact: all hearsay is hearsay; the unspeakable greatness of this Mystery of Life, let him acknowledge it or not, nay even though he seem to forget it or deny it, is ever present to him,—fearful and wonderful, on this hand and on that.” source