“Not to discuss with a man worthy of conversation is to waste the man. To discuss with a man not worthy of conversation is to waste words. The wise waste neither men nor words.”

"Tomorrow" (1919), as translated in A Soviet Heretic : Essays by Yevgeny Zamyatin (1970) edited and translated by Mirra Ginsburg
Context: Yesterday, there was a tsar, and there were slaves; today there is no tsar, but the slaves remain; tomorrow there will be only tsars. We march in the name of tomorrow's free man — the royal man. We have lived through the epoch of suppression of the masses; we are living in an epoch of suppression of the individual in the name of the masses; tomorrow will bring the liberation of the individual — in the name of man. Wars, imperialist and civil, have turned man into material for warfare, into a number, a cipher. Man is forgotten, for the sake of the sabbath. We want to recall something else to mind: that the sabbath is for man.
The only weapon worthy of man — of tomorrows's man — is the word.

Part I, ch. 1.
The Compleat Angler (1653-1655)

The Search For Common Ground : An Inquiry Into The Basis Of Man's Experience Of Community (1971), p. 6
Context: In the conflicts between man and man, between group and group, between nation and nation, the loneliness of the seeker for community is sometimes unendurable. The radical tension between good and evil, as man sees it and feels it, does not have the last word about the meaning of life and the nature of existence. There is a spirit in man and in the world working always against the thing that destroys and lays waste. Always he must know that the contradictions of life are not final or ultimate; he must distinguish between failure and a many-sided awareness so that he will not mistake conformity for harmony, uniformity for synthesis. He will know that for all men to be alike is the death of life in man, and yet perceive harmony that transcends all diversities and in which diversity finds its richness and significance.

"A Girl in a Library," lines 32-29
The Seven-League Crutches (1951)
Context: The soul has no assignments, neither cooks
Nor referees: it wastes its time. It wastes its time.
Here in this enclave there are centuries
For you to waste: the short and narrow stream
Of life meanders into a thousand valleys
Of all that was, or might have been, or is to be.
The books, just leafed through, whisper endlessly.

Source: A Prayer for Owen Meany

Source: 1980s, That Benediction is Where You Are (1985), p. 63
Context: Are we wasting our lives? By that word “wasting” we mean dissipating our energy in various ways, dissipating it in specialized professions. Are we wasting our whole existence, our life? If you are rich, you may say, “Yes, I have accumulated a lot of money, it has been a great pleasure.” Or if you have a certain talent, that talent is a danger to a religious life. Talent is a gift, a faculty, an aptitude in a particular direction, which is specialization. Specialization is a fragmentary process. So you must ask yourself whether you are wasting your life. You may be rich, you may have all kinds of faculties, you may be a specialist, a great scientist or a businessman, but at the end of your life has all that been a waste? All the travail, all the sorrow, all the tremendous anxiety, insecurity, the foolish illusions that man has collected, all his gods, all his saints and so on — have all that been a waste? You may have power, position, but at the end of it — what? Please, this is a serious question that you must ask yourself. Another cannot answer this question for you.

Μηκέθ᾽ ὅλως περὶ τοῦ οἷόν τινα εἶναι τὸν ἀγαθὸν ἄνδρα διαλέγεσθαι, ἀλλὰ εἶναι τοιοῦτον.
X, 16
Variant: Don't go on discussing what a good person should be. Just be one.
Source: Meditations (c. 121–180 AD), Book X

Source: Daring Greatly: How the Courage to Be Vulnerable Transforms the Way We Live, Love, Parent, and Lead

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Pythagorean Ethical Sentences