“If I am to be remembered, I hope it will not be primarily for my specialized scientific work, but as a generalist; one to whom, enlarging Terence's words, nothing human and nothing in external nature was alien.”

Act I, scene 1, line 25 (77).
Variant translations:
I am a human and consider nothing human alien to me.
I am human, I consider nothing human to be alien to me.
I am human, therefore nothing relating to humanity is outside of my concern.
I am a man; I consider nothing human alien to me.
I am a man, I regard nothing that is human alien to me.
I am a man, I count nothing human foreign to me.
Heauton Timorumenos (The Self-Tormentor)

"Our Knowledge of the Causes of the Phenomena of Organic Nature" (1863) http://aleph0.clarku.edu/huxley/CE2/Phen.html
1860s

Examples of self-translation (c. 2004), Quotes - Zitate - Citations - Citazioni

Here Comes There Goes You Know Who (1961)
Context: I believed from the beginning of remembered experience that I was somebody with an incalculable potential for enlargement, somebody who both knew and could find out, upon whom demands could be made with the expectation of having them fulfilled.
I felt at the same time, and pretty much constantly, that I was nothing in relation to Enormity, the Unknown, and the Unknowable. I was too vulnerable, too lacking in power, a thing of subtle reality, liable to be blown away without a moment's warning, a migrant with no meaning, no guide, no counsel, an entity in continuous transition, a growing thing whose stages of growth always went unnoticed, a fluid and flawed thing. Thus, there could be no extreme vanity in my recognition of myself, if in fact there could be any at all. I did frequently rejoice in the recognition, but I may have gotten that from some of the Protestant hymns I had heard, and knew, and had sung, such as Joy to the World. The simple fact was that if the song wasn't about me, I couldn't see how it could possibly be about anybody else, including the one I knew it was supposed to be about, and good luck to him, too.

Source: Tomorrow, When the War Began

The Book of My Life (1930)
Context: I have accustomed my features always to assume an expression quite contrary to my feelings; thus I am able to feign outwardly, yet within know nothing of dissumulation. This habit is easy if compared to the practice of hoping for nothing, which I have bent my efforts toward acquiring for fifteen successive years, and have at last succeeded.<!--Ch. 13

Source: 1890s, The Principles of Psychology (1890), Ch. 4