A wisdom deficit - fewer elders and even fewer people who listen to them.

It is said to await certainty is to await eternity.

Wisdom: It's something that you know when you see it. You can recognize it, you can experience it. I have defined wisdom as the capacity to make judgments that when looked back upon will seem to have been wise.

There is a moment of conception and a moment of birth, but between them there is a long period of gestation.

Reply when questioned on the safety of the polio vaccine he developed: It is safe, and you can't get safer than safe.

When you inoculate children with a polio vaccine, you don't sleep well for two or three months.

Our greatest responsibility is to be good ancestors.