I'd rather sing one wild song and burst my heart with it, than live a thousand years watching my digestion and being afraid of the wet.

Fear urged him to go back, but growth drove him on.

It is good that man should accept at face value the cheats of sense and snares of flesh, and through the fogs of sentiency pursue the lures and lies of passion.

White Fang knew the law well: to oppress the weak and obey the strong.

Kill or be killed, eat or be eaten, was the law; and this mandate, down out of the depths of Time.

You have grudged the very fire in your house because the wood cost overmuch!" he cried. "You have grudged life. To live cost overmuch, and you have refused to pay the price. Your life has been like a cabin where the fire is out and there are no blankets on the floor." He signaled to a slave to fill his glass, which he held aloft. "But I have lived. And I have been warm with life as you have never been warm. It is true, you shall live long. But the longest nights are the cold nights when a man shivers and lies awake. My nights have been short, but I have slept warm

Mental or spiritual health, which is rationality, makes for progress, and the future demands greater and greater mental or spiritual health, greater and greater rationality. The brain must dominate and direct both the individual and society in the time to come, not the belly and the heart.