“I viewed my fellow man not as a fallen angel, but as a risen ape.”

Variant: The question is this— Is man an ape or an angel? My Lord, I am on the side of the angels. I repudiate with indignation and abhorrence these new fanged theories.
Variant: Is man an ape or an angel? Now, I am on the side of the angels!
Source: Speech at Oxford Diocesan Conference (25 November 1864), quoted in William Flavelle Monypenny and George Earle Buckle, The Life of Benjamin Disraeli, Earl of Beaconsfield. Volume II. 1860–1881 (1929), p. 108

1860s
Variant: The question is this— Is man an ape or an angel? My Lord, I am on the side of the angels. I repudiate with indignation and abhorrence these new fanged theories.
Variant: Is man an ape or an angel? Now, I am on the side of the angels!
Speech at Oxford Diocesan Conference (25 November 1864), quoted in William Flavelle Monypenny and George Earle Buckle, The Life of Benjamin Disraeli, Earl of Beaconsfield. Volume II. 1860–1881 (London: John Murray, 1929), p. 108.

African Genesis: A Personal Investigation into the Animal Origins and Nature of Man (1961)

Equality (1943)
Context: I don't deserve a share in governing a hen-roost, much less a nation. Nor do most people — all the people who believe advertisements, and think in catchwords and spread rumors. The real reason for democracy is just the reverse. Mankind is so fallen that no man can be trusted with unchecked power over his fellows. Aristotle said that some people were only fit to be slaves. I do not contradict him. But I reject slavery because I see no men fit to be masters.

Source: Frankenstein

The monster to Robert Walton
Source: Frankenstein (1818)
Context: I was nourished with high thoughts of honour and devotion. But now crime has degraded me beneath the meanest animal. No guilt, no mischief, no malignity, no misery, can be found comparable to mine. When I run over the frightful catalogue of my sins, I cannot believe that I am the same creature whose thoughts were once filled with sublime and transcendent visions of the beauty and the majesty of goodness. But it is even so; the fallen angel becomes a malignant devil. Yet even that enemy of God and man had friends and associates in his desolation; I am alone.
Context: I seek not a fellow feeling in my misery. No sympathy may I ever find. When I first sought it, it was the love of virtue, the feelings of happiness and affection with which my whole being overflowed, that I wished to be participated. But now that virtue has become to me a shadow, and that happiness and affection are turned into bitter and loathing despair, in what should I seek for sympathy? I am content to suffer alone while my sufferings shall endure; when I die, I am well satisfied that abhorrence and opprobrium should load my memory. Once my fancy was soothed with dreams of virtue, of fame, and of enjoyment. Once I falsely hoped to meet with beings who, pardoning my outward form, would love me for the excellent qualities which I was capable of unfolding. I was nourished with high thoughts of honour and devotion. But now crime has degraded me beneath the meanest animal. No guilt, no mischief, no malignity, no misery, can be found comparable to mine. When I run over the frightful catalogue of my sins, I cannot believe that I am the same creature whose thoughts were once filled with sublime and transcendent visions of the beauty and the majesty of goodness. But it is even so; the fallen angel becomes a malignant devil. Yet even that enemy of God and man had friends and associates in his desolation; I am alone.

A similar remark was reportedly made by Pratchett in The Herald (4 October 2004): I'd rather be a climbing ape than a falling angel.
"I create gods all the time - now I think one might exist" (2008)
Context: Evolution was far more thrilling to me than the biblical account. Who would not rather be a rising ape than a falling angel? To my juvenile eyes Darwin was proved true every day. It doesn't take much to make us flip back into monkeys again.

Letter to J. G. Gmelin (1747) as quoted by Jeffrey H. Schwartz, Sudden Origins: Fossils, Genes, and the Emergence of Species (1999)