“These little things are great to little man.”

"A Grammarian's Funeral", line 115.
Men and Women (1855)
Context: That low man seeks a little thing to do,
Sees it and does it.
This high man, with a great thing to pursue,
Dies ere he knows it.
That low man goes on adding one to one,—
His hundred's soon hit;
This high man, aiming at a million,
Misses an unit.
That has the world here—should he need the next,
Let the world mind him!
This throws himself on God, and unperplexed
Seeking shall find him.

1840s, Essays: First Series (1841), Compensation
Context: Our strength grows out of our weakness. The indignation which arms itself with secret forces does not awaken until we are pricked and stung and sorely assailed. A great man is always willing to be little. Whilst he sits on the cushion of advantages, he goes to sleep. When he is pushed, tormented, defeated, he has a chance to learn something; he has been put on his wits, on his manhood; he has gained facts; learns his ignorance; is cured of the insanity of conceit; has got moderation and real skill. The wise man throws himself on the side of his assailants. It is more his interest than it is theirs to find his weak point. The wound cicatrizes and falls off from him like a dead skin, and when they would triumph, lo! he has passed on invulnerable. Blame is safer than praise. I hate to be defended in a newspaper. As long as all that is said is said against me, I feel a certain assurance of success. But as soon as honeyed words of praise are spoken for me, I feel as one that lies unprotected before his enemies. In general, every evil to which we do not succumb is a benefactor.

Listen, Little Man! (1948)
Context: You are different from the really great man in only one thing: The great man, at one time, also was a very little man, but he developed one important ability: he learned to see where he was small in his thinking, and actions. Under the pressure of some task which was dear to him he learned better and better to sense the threat that comes from his smallness and pettiness. The great man, then, knows when and in what he is a little man.

Source: The Jewel of Seven Stars

Source: The Friends of Voltaire (1906), Ch. 2 : Diderot : The Talker, p. 61

Attributed to Carlyle in Dale Carnegie's How to Win Friends And Influence People (1936), but this quotation is not found in Carlyle's known works. The first mention found in Google Books dates from 1908, where the Rev. John Timothy Stone https://en.wikipedia.org/wiki/John_Timothy_Stone is quoted as claiming: 'The greatest critics of this world have been appreciators. Carlyle said, "You can discover a great man, or see a great man, by the way he treats little men.'
The quotation is subsequently found in slightly different forms, mostly in religious publications: "A great man shows his greatness by manner in which he treats little men" (1913, unattributed); The exact wording of Carnegie's quote suggests that it was taken from Stone's 1930 publication.
Disputed

Listen, Little Man! (1948)
Context: You are Great, Little Man, when you are not small and petty. You are great when you carry on your trade lovingly, when you enjoy carving and building and painting and decorating and sowing, when you enjoy the blue sky and the deer and the dew and music and dancing, your growing children and the beautiful body of your woman or your man, when you learn to understand and think about life.

Listen, Little Man! (1948)
Context: My intellect tells me: "Tell the truth at any cost." The Little Man in me says: "It is stupid to expose oneself to the little man, to put oneself at his mercy. The Little Man does not want to hear the truth about himself. He does not want the great responsibility which is his. He wants to remain a Little Man. He wants to remain a Little Man, or wants to become a little great man. He wants to become rich, or a party leader, or commander of a legion, or secretary of the society for the abolition of vice. But he does not want to assume responsibility for his work..."