“The biggest disease today is not leprosy or tuberculosis, but rather the feeling of being unwanted.”
As quoted by Malcolm Muggeridge in Something Beautiful for God http://books.google.com/books?id=irO7hAQLmsMC&q="The+biggest+disease+today+is+not+leprosy+or+tuberculosis+but+rather+the+feeling+of+being+unwanted"&pg=PA73#v=onepage (1971)
1970s
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Matka Tereza 52
Roman Catholic saint of Albanian origin 1910–1997Related quotes

“to start at a new place is always to feel incompetent & unwanted.”
Letter to Winifred Arnott, 7 October 1953
“Contempt is the weapon of the weak and a defense against one's own despised and unwanted feelings.”

“Ён Прыехаў, Сам Памёр, Усё Спакойна…” Апошнія Тыдні Васіля Быкава https://www.svaboda.org/amp/24853764.html // svaboda.org
(in Belarusian)

“Joy is more infectious than leprosy.”
Talking about the joy one gets working at his institution, Anandwan, a home for leprosy that was established by him, page=22
Baba Amte: A Vision of New India

“"Linux is a leprosy; …" This statement is not grammatically or factually correct.”
Rebuttal to Ken Brown http://www.cs.vu.nl/~ast/brown/rebuttal/.
The "Linux is Obsolete" Debate