“That which is, grows, while that which is not, becomes.”

— Galén

Galen, On the Natural Faculties, Bk. 2, sect. 3; cited from Arthur John Brock (trans.) On the Natural Faculties (London: Heinemann, 1963) p. 139.

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Galén 11

Roman physician, surgeon and philosopher 129–216

Christian D. Larson (1874–1962) Prolific author of metaphysical and New Thought books

Source: Your Forces and How to Use Them (1912), Chapter 8, p. 126–127

“In many parts of the plains thorny jungles grow, behind the good defence of which the people… become stubbornly rebellious… and pay no taxes.”

Babur (1483–1530) 1st Mughal Emperor

“Malraux writes in a language in which there is no way to say "perhaps" or "I don't know," so that after a while we grow accustomed to saying it for him.”

Randall Jarrell (1914–1965) poet, critic, novelist, essayist

"Malraux and the Statues at Baumberg," Art News (December 1953) [p. 180]
Kipling, Auden & Co: Essays and Reviews 1935-1964 (1980)

“It is the dissimilarities and inequalities among men which give rise to the notion of honor; as such differences become less, it grows feeble; and when they disappear, it will vanish too.”

Alexis De Tocqueville book Democracy in America

Book Three, Chapter XVIII.
Democracy in America, Volume II (1840), Book Three

“Fear is a strange soil. It grows obedience like corn, which grow in straight lines to make weeding easier. But sometimes it grows the potatoes of defiance, which flourish underground.”

Terry Pratchett book Small Gods

Source: Small Gods

“In the region of nature, which is the region of diversity, we grow by acquisition; in the spiritual world, which is the region of unity, we grow by losing ourselves, by uniting.”

Rabindranath Tagore (1861–1941) Bengali polymath

Sādhanā : The Realisation of Life http://www.spiritualbee.com/spiritual-book-by-tagore/ (1916)
Context: Though the West has accepted as its teacher him who boldly proclaimed his oneness with his Father, and who exhorted his followers to be perfect as God, it has never been reconciled to this idea of our unity with the infinite being. It condemns, as a piece of blasphemy, any implication of man's becoming God. This is certainly not the idea that Christ preached, nor perhaps the idea of the Christian mystics, but this seems to be the idea that has become popular in the Christian west.
But the highest wisdom in the East holds that it is not the function of our soul to gain God, to utilise him for any special material purpose. All that we can ever aspire to is to become more and more one with God. In the region of nature, which is the region of diversity, we grow by acquisition; in the spiritual world, which is the region of unity, we grow by losing ourselves, by uniting. Gaining a thing, as we have said, is by its nature partial, it is limited only to a particular want; but being is complete, it belongs to our wholeness, it springs not from any necessity but from our affinity with the infinite, which is the principle of perfection that we have in our soul.