“it istrue that good can follow only from good and evil only from evil, but that often the opposite is true. Anyone who fails to see this is, indeed, a political infant.”

Source: An Introduction to the Principles of Morals and Legislation (1789; 1823), Ch. 10: Of Motives

Source: Meditations

On Virginity 6.1

[Harrison, Carol, Truth in a Heresy?, The Expository Times, 2016, 112, 3, 78–82, 10.1177/001452460011200302]
On Virginity

The First Octavo Notebook https://docs.google.com/document/d/1gD981HZ190BUJF-3czZNX3DsFWvqp3cq-Z4QS4d-9gw/edit?hl=en
The Blue Octavo Notebooks (1954)

Congressional speech (1849)
Context: I affirm, in words as true and literal as any that belong to geometry, that the man who withholds knowledge from a child not only works diabolical miracles for the destruction of good, but for the creation of evil also. He who shuts out truth, by the same act opens the door to all the error that supplies its place. Ignorance breeds monsters to fill up all the vacuities of the soul that are unoccupied by the verities of knowledge. He who dethrones the idea of law, bids chaos welcome in its stead. Superstition is the mathematical complement of religious truth; and just so much less as the life of a human being is reclaimed to good, just so much more is it delivered over to evil. The man or the institution, therefore, that withholds knowledge from a child, or from a race of children, exercises the awful power of changing the world in which they are to live, just as much as though he should annihilate all that is most lovely and grand in this planet of ours, or transport the victim of his cruelty to some dark and frigid zone of the universe, where the sweets of knowledge are unknown, and the terrors of ignorance hold their undisputed and remorseless reign.

The words of Socrates, as quoted by Diogenes Laertius.
Misattributed