“The naturalists, you know, distribute the history of nature into three kingdoms or departments: zoology, botany, mineralogy. Ideology, or mind, however, occupies so much space in the field of science, that we might perhaps erect it into a fourth kingdom or department. But inasmuch as it makes a part of the animal construction only, it would be more proper to subdivide zoology into physical and moral.”
Thomas Jefferson, Letter (24 Mar 1824) to Mr. Woodward. Collected in The Writings of Thomas Jefferson: Correspondence (1854), 339.
Posthumous publications, On botany
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Thomas Jefferson 456
3rd President of the United States of America 1743–1826Related quotes
From "Order and Disorder in Nature", 1958 Proceedings of the Geologists' Association, 69, 2, 77-82.

The Ageless Wisdom, An Introduction to Humanity's Spiritual Legacy (1996)

Source: The Geological Evidences of the Antiquity of Man (1863), Ch.21, p. 412

Source: De architectura (The Ten Books On Architecture) (~ 15BC), Book I, Chapter III "The Departments of Architecture" Sec. 1

Letter to (22 August 1774), as published in The Life of John Jay (1833) by William Jay, Vol. 2, p. 345.
1770s, Letter to Lindley Murray (1774)
Context: Among the strange things of this world, nothing seems more strange than that men pursuing happiness should knowingly quit the right and take a wrong road, and frequently do what their judgments neither approve nor prefer. Yet so is the fact; and this fact points strongly to the necessity of our being healed, or restored, or regenerated by a power more energetic than any of those which properly belong to the human mind.
We perceive that a great breach has been made in the moral and physical systems by the introduction of moral and physical evil; how or why, we know not; so, however, it is, and it certainly seems proper that this breach should be closed and order restored. For this purpose only one adequate plan has ever appeared in the world, and that is the Christian dispensation. In this plan I have full faith. Man, in his present state, appears to be a degraded creature; his best gold is mixed with dross, and his best motives are very far from being pure and free from earth and impurity.