“Loneliness is the poverty of self; solitude is richness of self.”
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May Sarton 26
American poet, novelist, and memoirist 1912–1995Related quotes

Incorrectly attributed to Foster, according to snopes.com https://www.snopes.com/attacking-the-rich/
Misattributed

Rich Dad Poor Dad: What the Rich Teach Their Kids About Money-That the Poor and the Middle Class Do Not!

“Loneliness is caused by an alienation from life. It is a loneliness from your real self.”

“Poverty is the self's greed and increased despair.”
Majlisi, Bihārul Anwār, vol.78, p. 368.
General

“The cure for loneliness is solitude.”
Source: Complete Prose of Marianne Moore