“A philosopher has remarked that if a man knew that he had thirty years of life before him, it would not be an unwise thing to spend twenty of those years in mapping out a plan of living, and putting himself under rule; for he would do more with the ten well-arranged years than with the whole thirty if he spent them at random. There is much truth in that saying. A man will do little by firing off his gun if he has not learned to take aim.”
A Good Start: A Book for Young Men and Women, (1898)
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Charles Spurgeon 49
British preacher, author, pastor and evangelist 1834–1892Related quotes

As quoted in "James Tiptree Jr: The Double Life of Alice B. Sheldon" (2006) by Julie Phillips

Il faut vingt ans pour mener l’homme de l’état de plante où il est dans le ventre de sa mère, et de l’état de pur animal, qui est le partage de sa première enfance, jusqu’à celui où la maturité de la raison commence à poindre. Il a fallu trente siècles pour connaître un peu sa structure. Il faudrait l’éternité pour connaître quelque chose de son âme. Il ne faut qu’un instant pour le tuer.
"Man: General Reflection on Man" (1771)
Citas, Questions sur l'Encyclopédie (1770–1774)
Self-written "Obituary" (24 March 1932), published 16 years prior to his actual death, as quoted in The Voice of Small-Town America : The Selected Writings of Robert Quillen, 1920-1948 (2008) by John Hammond Moore, p. 181
Context: He was a writer of paragraphs and short editorials. He always hoped to write something of permanent value, but the business of making a living took most of his time and he never got around to it. In his youth he felt an urge to reform the world, but during the latter years of his life he decided that he would be doing rather well if he kept himself out of jail. … When the last clod had fallen, workmen covered the grave with a granite slab bearing the inscription: "Submitted to the Publisher by Robert Quillen."

“He had learned self-control in a hard school. He had been married for thirty years.”
Source: The Silver Spike (1989), Chapter 26 (p. 528)
"The Individual and Political Life of Information Systems", in Heilprin, Markuson, and Goodman, ed., Proceedings of the Symposium on Education for Information Science, Warrenton, Virginia, September 7-10, 1965 (Washington, DC: Spartan Books, 1965)