Source: Dictionary of Burning Words of Brilliant Writers (1895), P. 297.
“For a persistent and continued ascent to [the Principle and Source of] life is the constituent element of increased happiness.”
De Docta Ignorantia (On Learned Ignorance) (1440)
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Nicholas of Cusa 49
German philosopher, theologian, jurist, and astronomer 1401–1464Related quotes

1960s, Operating Manual for Spaceship Earth (1963)

The Natural History of Intellect (1893) http://www.rwe.org/natural-history-of-intellect.html

How Many People Can Live on Planet Earth? (BBC Horizon, 2009)

Source: 1910s, Mysticism and Logic and Other Essays http://archive.org/stream/mysticism00russuoft/mysticism00russuoft_djvu.txt (1918), Ch. 2: The Place of Science in a Liberal Education

“Satisfaction of one's curiosity is one of the greatest sources of happiness in life.
Linus Pauling”

Source: Man for Himself (1947), Ch. 3; in Ch. 2 of his later work The Art of Loving (1956) a similar statement is made :
Context: Care and responsibility are constituent elements of love, but without respect for and knowledge of the beloved person, love deteriorates into domination and possessiveness. Respect is not fear and awe; it denotes, in accordance with the root of the word (respicere = to look at), the ability to see a person as he is, to be aware of his individuality and uniqueness. To respect a person is not possible without knowing him; care and responsibilty would be blind if they were not guided by the knowledge of the person's individuality.