“Virginity, mysticism, melancholy, – three unknown words, – three new maladies brought in by Christ.”

Our Christ : The Revolt of the Mystical Genius (1921)
Context: In point of fact there are two kinds sorts of mysticism, differing from one another as the ranting of drunkards from the language of illumined spirits. There is the muddled, stammering mysticism, and there is the mysticism luminous with truly ultimate ideas. On the one hand there are the empty dimness and darkness, the barren, chilling sentimentalism and mental debauchery, the foolishly grimacing but rigid phantasms of the Cabbala, of occultism, mysteriosophy and theosophy. We cannot draw too sharp a dividing line between these and the brightness, the simple sincerity, and healthy, rejuvenating strength of genuine mysticism, which takes the most precious gems from philosophy's treasure chest and displays them in the beauty of its own setting. Mysticism is in complete accord with the result, with the sum of philosophy. In fact, mysticism is precisely the sum and the soul of philosophy, in the form of that rapturous, passionate outpouring of love.... We are concerned with an understanding of this serious mysticism, and its meaning could be stated in three words... godlessness... freedom from the world... blessedness of soul.

Zwingli Opera, Corpus Reformatorum, Volume 1, p. 424.

Source: The Last Lecture (2008), Chapter 48: Tell the Truth, p. 163

Words reportedly said to his physician in his final days, but not his last words, as quoted in Our Lord Don Quixote : The Life of Don Quixote and Sancho, with Related Essays (1967) by Miguel de Unamuno, as translated by Anthony Kerrigan, p. 386
The exact word used by Bolívar in Spanish is "majadero", whose meaning is "a person who insists with inopportune obstinacy in a pretension."
Variant translations or versions:
The three greatest fools of history have been Jesus Christ, Don Quixote — and I!
As quoted in Simón Bolívar and Spanish American Independence, 1783-1830 (1968) by John J. Johnson and Doris M. Ladd, p. 115
The three greatest idiots in history, have been Jesus Christ, Don Quixote, and myself.
As quoted in Nineteenth-century Gallery : Portraits of Power and Rebellion (1970) by Stanley Edward Ayling, p. 122
In the course of history, there have been three radicals: Jesus Christ, Don Quixote, and... me.
The three biggest fools in the world have been Jesus Christ, Don Quixote, and... me.
Jesus Christ, Don Quixote and I: three greatest fools of history.
We have sewn the sea — Jesus Christ, Don Quixote and me: the three great fools of history...
I’ve been plowing in the sea. Jesus Christ, Don Quixote and I — the three great mavericks of history.
Source: http://dle.rae.es/srv/fetch?id=NwsNlzj

Hope, Faith, and Love (c. 1786); also known as "The Words of Strength", as translated in The Common School Journal Vol. IX (1847) edited by Horace Mann, p. 386
Context: There are three lessons I would write, —
Three words — as with a burning pen,
In tracings of eternal light
Upon the hearts of men. Have Hope. Though clouds environ now,
And gladness hides her face in scorn,
Put thou the shadow from thy brow, —
No night but hath its morn. Have Faith. Where'er thy bark is driven, —
The calm's disport, the tempest's mirth, —
Know this: God rules the hosts of heaven,
The habitants of earth. Have Love. Not love alone for one,
But men, as man, thy brothers call;
And scatter, like the circling sun,
Thy charities on all. Thus grave these lessons on thy soul, —
Hope, Faith, and Love, — and thou shalt find
Strength when life's surges rudest roll,
Light when thou else wert blind.

Source: The Moon and More

His well-known advice to the young William Crookes, who had asked him the secret of his success as a scientific investigator, as quoted in Michael Faraday (1874) by John Hall Gladstone, p. 123