Though we may reach the foremost heights of intellectual achievement, we will forever remain bound by the shackles of human nature and instinct.

Great nations of the past! Very little for us have you left to do; all boundaries you conquered, all knowledge you obtained. Yet there remains one mountain unclimbed, one mystery unsolved; the greed of man, the lust of man.

It is our dreams that propel us into the skies, and bring about the winds upon which we may ride to the golden gates of achievement.

You put too much stock in human intelligence, it doesn't annihilate human nature.

The more you see, the less you know.

The instinct to survive is human nature itself, and every aspect of our personalities derives from it. Anything that conflicts with the survival instinct acts sooner or later to eliminate the individual and thereby fails to show up in future generations. . . . A scientifically verifiable theory of morals must be rooted in the individual's instinct to survive--and nowhere else!--and must correctly describe the hierarchy of survival, note the motivations at each level, and resolve all conflicts.
We have such a theory now; we can solve any moral problem, on any level. Self-interest, love of family, duty to country, responsibility toward the human race . . . .
The basis of all morality is duty, a concept with the same relation to group that self-interest has to individual.