A man shall and must be valiant; he must march forward, and quit himself like a man,—trusting imperturbably in the appointment and choice of the upper Powers; and, on the whole, not fear at all. Now and always, the completeness of his victory over Fear will determine how much of a man he is.
 Thomas Carlyle, On Heroes, Hero-Worship, and The Heroic in History (1841). copy citation

Context

“A man's acts are slavish, not true but specious; his very thoughts are false, he thinks too as a slave and coward, till he have got Fear under his feet. Odin's creed, if we disentangle the real kernel of it, is true to this hour. A man shall and must be valiant; he must march forward, and quit himself like a man,—trusting imperturbably in the appointment and choice of the upper Powers; and, on the whole, not fear at all. Now and always, the completeness of his victory over Fear will determine how much of a man he is. It is doubtless very savage that kind of valor of the old Northmen. Snorro tells us they thought it a shame and misery not to die in battle; and if natural death seemed to be coming on, they would cut wounds in their flesh, that Odin might receive them as warriors slain.” source