“We are at that one of life's hours (it strikes for every man) when truth imposes itself, by itself, with irresistible obviousness, when each of us has only to stretch forth his arms to reach at a single bound the surface of shadows, even the sunlight of God. Then is human prudence but a snare and a delusion. Sanctity!' cried out the old priest in a deep voice; 'by saying this word in your presence and for you alone, I know the hurt I inflict upon you! You are not unaware of what sanctity is: a vocation, a calling. Up to the place where God awaits you you will have to climb—climb, or be lost. Expect no human help.”

Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 91.

Kaddish for a Child Not Born (1990)

1980s, First term of office (1981–1985), Abortion and the Conscience of the Nation (1983)

Source: It's Not Summer Without You

Variant: Don't you know that a midnight hour comes when everyone has to take off his mask? Do you think life always lets itself be trifled with? Do you think you can sneak off a little before midnight to escape this?
Source: Either/Or, Part I

Source: The Absolutely True Diary of a Part-Time Indian

A variant of part of this statement is often quoted: Just because your voice reaches halfway around the world doesn't mean you are wiser than when it reached only to the end of the bar.
RTNDA Convention Speech (1958)
Context: I have no technical advice or counsel to offer those of you who labor in this vineyard, the one that produces words and pictures. You will, I am sure, forgive me for not telling you that instruments with which you work are miraculous, that your responsibility is unprecedented or that your aspirations are frequently frustrated. It is not necessary to remind you of the fact that your voice, amplified to the degree where it reaches from one end of the country to the other, does not confer upon you greater wisdom than when your voice reached only from one end of the bar to the other. All of these things you know.