“I suspect that much of life is like that. We seldom see what is closest to our eyes.”

Other Inquisitions (1952), The Modesty of History
Context: I have suspected that history, real history, is more modest and that its essential dates may be, for a long time, secret. A Chinese prose writer has observed that the unicorn, because of its own anomaly, will pass unnoticed. Our eyes see what they are accustomed to seeing. Tacitus did not perceive the Crucifixion, although his book recorded it.

Questa vita terrena è quasi un prato,
che 'l serpente tra' fiori et l'erba giace;
et s'alcuna sua vista agli occhi piace,
è per lassar piú l'animo invescato.
Canzone 99, st. 2
Il Canzoniere (c. 1351–1353), To Laura in Life

Source: The Conquest of Fear (1921), Chapter III : God And His Self-Expression, § VIII
Context: I was to see myself as God's Self-Expression working with others who were also His Self-Expression to the same extent as I. It was in the fact of our uniting together to produce His Self-Expression that I was to look for my security. No one could effectively work against me while I was consciously trying to work with God. Moreover, it was probable that no one was working against me, or had any intention of working against me, but that my own point of view being wrong I had put the harmonious action of my life out of order. Suspicion always being likely to see what it suspects the chances were many that I was creating the very thing I suffered from.
This does not mean that in our effort to reproduce harmonious action we should shut our eyes to what is evidently wrong, or blandly ignore what is plainly being done to our disadvantage. Of course not! One uses all the common-sense methods of getting justice for oneself and protecting one's own interests. But it does mean that when I can no longer protect my own interests, when my affairs depend upon others far more than on myself — a condition in which we all occasionally find ourselves — I am not to fret myself, not to churn my spirit into nameless fears. I am not a free agent. Those with whom I am associated are not free agents. God is the one supreme command. He expresses Himself through me; He expresses Himself through them; we all.

Source: Drenai series, The Swords of Night and Day, Ch. 11
Context: We are closest to life when we are vying with death... The blood runs hot, the air smells sweet, the sky becomes an unbearably beautiful blue. Battle is intoxicating. That is why the ghastly vileness of war has always been so popular.

Source: Iron Lake

Source: The Way of All Flesh (1903), Ch. 11

Frequently quoted on social media, but was not written by Rumi in Persian.
Misattributed

Speech in Philadelphia (1776)