“In general, these phenomena are very easy to perceive and understand, but difficult to calculate. The danger of failure increases rapidly with decreasing depth or thickness of the structural member…”
p, 125
Philosophy of Structures (1958)
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Eduardo Torroja 29
Spanish architect 1899–1961Related quotes

“Speeches easy to young speakers are generally very difficult to old listeners.”
Source: The Duke's Children (1879), Ch. 56

“A decrease in the quantity of legislation generally means an increase in the quality of life.”
Column, December 23, 2007, "The Gift Of Doing Very Little" http://www.washingtonpost.com/wp-dyn/content/article/2007/12/21/AR2007122101922.html at washingtonpost.com.
2000s

The Construction of the Wonderful Canon of Logarithms (1889)

“To understand is difficult; to act is easy.”
As quoted in Great Britain and the East, Vol. 61, Issues 1727-1742 (1944), p. 19 https://books.google.com/books?id=94AyAQAAIAAJ&q=%22To+understand+is+difficult;+to+act+is+easy%22&dq=%22To+understand+is+difficult;+to+act+is+easy%22&hl=en&sa=X&ved=0ahUKEwiey5eF27fXAhWMHpQKHS3JCYAQ6AEILDAB
Façade of Democracy (1991)
Source: The Agony and the Ecstasy

“In proportion therefore, as the repulsiveness of the work increases, the wage decreases.”
Source: The Communist Manifesto

“It is not a daily increase, but a daily decrease. Hack away at the inessentials.”