In this world, headwinds are far more prevalent than winds from astern (that is, if you never violate the Pythagorean maxim). - Herman Melville

If possible, not to let the men so much as surmise that their officers anticipate aught amiss from them is the tacit rule in a military ship. And the more that some sort of trouble should really be apprehended the more do the officers keep that apprehension to themselves; tho' not the less unostentatious vigilance may be augmented. In the present instance the sentry placed over the prisoner had strict orders to let no one have communication with him but the Chaplain. And certain unobtrusive measures were taken absolutely to insure this point.

"I will have no man in my boat," said Starbuck, "who is not afraid of a whale." By this, he seemed to mean, not only that the most reliable and useful courage was that which arises from the fair estimation of the encountered peril, but that an utterly fearless man is a far more dangerous comrade than a coward.
(moby dick chap 26 p112)

But while this sleep, this dream is on ye, move your foot or hand an inch; slip your hold at all; and your identity comes back in horror. Over Descartian vortices you hover. And perhaps, at mid-day, in the fairest weather, with one half-throttled shriek you drop through the transparent air into the summer sea, no more to rise forever.