The powers of the mind should be concentrated and the mind turned back upon itself; as the darkest places reveal their secrets before the penetrating rays of the sun, so will the concentrated mind penetrate its own innermost secrets.
If someone hacks your password, you can change it - as many times as you want. You can’t change your fingerprints. You have only ten of them. And you leave them on everything you touch; they are definitely not a secret.
The comprehensibility of the world seems to me a wonder or eternal secret. Here lies the sense of wonder which increases even more with the development of our knowledge.
Truly, there are terrible primal arcana of earth which had better be left unknown and unevoked; dread secrets which have nothing to do with man, and which man may learn only in exchange for peace and sanity; cryptic truths which make the knower evermore an alien among his kind, and cause him to walk alone on earth.
Like a flash of lightning and in an instant the truth was revealed. I drew with a stick on the sand the diagrams of my motor. A thousand secrets of nature which I might have stumbled upon accidentally I would have given for that one which I had wrestled from her against all odds and at the peril of my existence.
Heroism works in contradiction to the voice of mankind and in contradiction, for a time, to the voice of the great and good. Heroism is an obedience to a secret impulse of an individual