“A natural right in the strict sense is that which is naturally under a person’s control, his body with its faculties of movement, feeling, thought, and speech. By extension, a natural right is what a person brings under his control without violating any other person’s natural rights.”

Source: Discovery of Freedom: Man's Struggle Against Authority (1943), p. xii.

Natural ragione è di ciascuno che ci nasce, la sua vita, quanto può, aiutare e conservare e difendere.
First Day, Introduction
The Decameron (c. 1350)

Sources of Chinese Tradition (1999), vol. 1, p. 180
Human nature is evil

Section II, Chap. II.
The Theory of Moral Sentiments (1759), Part II

Second Treatise of Government, Ch. IX, sec. 123
Two Treatises of Government (1689)

Ten Sermons of Religion (1853), III : Of Justice and the Conscience https://en.wikisource.org/wiki/Ten_Sermons_of_Religion/Of_Justice_and_the_Conscience
Context: Man naturally loves justice, for its own sake, as the natural object of his conscience. As the mind loves truth and beauty, so conscience loves the right; it is true and beautiful to the moral faculties. Conscience rests in justice as an end, as the mind in truth. As truth is the side of God turned towards the intellect, so is justice the side of Him which conscience looks upon. Love of justice is the moral part of piety.

Speech (3 January 1834), quoted in Lafayette in Two Worlds: Public Cultures and Personal Identities in an Age of Revolutions (1999), p. 256
Context: True republicanism is the sovereignty of the people. There are natural and imprescriptible rights which an entire nation has no right to violate, just as national sovereignty is above the secondary agreements of the government.

Source: Democracy: An American Novel (1880), Ch. XI