“You’ve climbed too many mountains and crossed too many rivers to stop and turn back now.”

“save your limited but vital life energy for a vibrant, longer, healthier, and happier life.”

“As I observe the lives of great individuals, I sense that the capacity of the brain is seemingly infinite. Wise men can become even wiser as each experience builds upon previous experience. Indeed, continuing exercise of the intellect brings forth increased intellectual capacity.”

“Many things can prolong your life, but only wisdom can save it.”

“There is a danger there – a very real danger to humanity. Consider, Watson, that the material, the sensual, the worldly would all prolong their worthless lives. The spiritual would not avoid the call to something higher. It would be the survival of the least fit. What sort of cesspool may not our poor world become?”