“The members of Christ, many though they be, are bound to one another by the ties of charity and peace under the one Head, who is our Saviour Himself, and form one man. Often their voice is heard in the Psalms as the voice of one man; the cry of one is as the cry of all, for all are one in One.”

De Testimonio Animae (The Testimony of the Soul), 6.3
Context: Man is one name belonging to every nation upon earth. In them all is one soul though many tongues. Every country has its own language, yet the subjects of which the untutored soul speaks are the same everywhere.

Source: On the Mystical Body of Christ, p.430

Source: On the Mystical Body of Christ, pp. 424-425
Context: What does the Scripture mean when it tells us of the body of one man so extended in space that all can kill him? We must understand these words of ourselves, of our Church, or the body of Christ. For Jesus Christ is one man, having a Head and a body. The Saviour of the body and the members of the body are two in one flesh, and in one voice, and in one passion, and, when iniquity shall have passed away, in one repose.
And so the passion of Christ is not in Christ alone; and yet the passion of Christ is in Christ alone. For if in Christ you consider both the Head and the body, the Christ’s passion is in Christ alone; but if by Christ you mean only the Head, then Christ’s passion is not in Christ alone. Hence if you are in the members of Christ, all you who hear me, and even you who hear me not (though you do hear, if you are united with the members of Christ), whatever you suffer at the hands of those who are no among the members of Christ, was lacking to the sufferings of Christ. It is added precisely because it was lacking. You fill up the measure; you do not cause it to overflow. You will suffer just so much as must be added of your sufferings to the complete passion of Christ, who suffered as our Head and who continues to suffer in His members, that is, in us. Into this common treasury each pays what he owes, and according to each one’s ability we all contribute our share of suffering. The full measure of the Passion will not be attained until the end of the world.

"Count Magnus", from Ghost Stories of an Antiquary (1904); The Collected Ghost Stories of M. R. James (London: Edward Arnold, 1947) p. 111.

Nur wer einig ist mit der Welt kann einig seyn mit sich selbst.
“Ideas,” Lucinde and the Fragments, P. Firchow, trans. (1991), § 130

1840s, Essays: First Series (1841), Circles

2:7
Pirkei Avot

Thought of a Briton on the Subjugation of Switzerland, l. 1 (1807).

Genesis 3:8
The Sinfulness of Sin