“Between saying and doing, many a pair of shoes is worn out.”
“With sixty professors there are roughly eighteen hundred pairs of professors. Out of that many pairs it was not surprising that there were some whose members did not like one another.”
Source: Adventures of a Mathematician - Third Edition (1991), Chapter 5, Harvard Years, p. 91
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Stanislaw Ulam 33
Polish-American mathematician 1909–1984Related quotes

Draft for a Statement of Human Obligation (1943), Statement Of Obligations
Context: The needs of the soul can for the most part be listed in pairs of opposites which balance and complete one another.
The human soul has need of equality and of hierarchy.
Equality is the public recognition, effectively expressed in institutions and manners, of the principle that an equal degree of attention is due to the needs of all human beings. Hierarchy is the scale of responsibilities. Since attention is inclined to direct itself upwards and remain fixed, special provisions are necessary to ensure the effective compatibility of equality and hierarchy.

Source: What On Earth Is About To Happen… For Heaven’s Sake? (2013), p. 80

Aleksandrowicz had something of a sage in himself.
Kobos, Andrzej (2009). Po drogach uczonych (in Polish). 4. Kraków: Polska Akademia Umiejętności, pp. 383–398. ISBN 978-83-7676-021-6.
Injury Time (London: Abacus, [1977] 2003) ch. 4, pp. 41-42.