“For Hades, ruler of the nether sphere,
Exactest auditor of human kind,
Graved on the tablet of his mind
Doth every trespass read.”
Source: Oresteia (458 BC), Eumenides, lines 273–275 (tr. Anna Swanwick)
Original
Μέγας γὰρ Ἅιδης ἐστὶν εὔθυνος βροτῶν ἔνερθε χθονός, δελτογράφῳ δὲ πάντ᾽ ἐπωπᾷ φρενί.
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Aeschylus 119
ancient Athenian playwright -525–-456 BCRelated quotes

“Aristotle compared the mind of man to a blank tablet on which nothing was written, but on which all things could be engraved. … There is, however, this difference, that on the tablet the writing is limited by space, while in the case of the mind, you may continually go on writing and engraving without finding any boundary, because, as has already been shown, the mind is without limit.”
Aristoteles hominis animum comparavit tabulae rasae, cui nihil inscriptum sit, inscribi tamen omnia possint. … Hoc interest, quod in tabula lineas ducere non licet, nisi quousque margo permittat: in mente usque et usque scribendo, et sculpendo, terminum nusquam invenies quia (ut ante monitum) interminabilis est.
The Great Didactic (Didactica Magna) (Amsterdam, 1657) [written 1627–38], as translated by M. W. Keatinge (1896).
Cf. Aristotle, De anima, III, 4, 430a: "δυνάμει δ' οὕτως ὥσπερ ἐν γραμματείῳ ᾧ μηθὲν ἐνυπάρχει ἐντελεχείᾳ γεγραμμένον· ὅπερ συμβαίνει ἐπὶ τοῦ νοῦ."

“One sole God;
One sole ruler, — his Law;
One sole interpreter of that law — Humanity.”
Life and Writings: Young Europe: General Principles. No. 1., reported in Hoyt's New Cyclopedia Of Practical Quotations (1923), p. 318

Song lyrics, Knocked Out Loaded (1986), Brownsville Girl (with Sam Shepard)

“There is a reward for kindness to every living animal or human.”
Muhammad narrated in Saheeh Muslim, #2244, and Saheeh Al-Bukhari, #2466.
Sunni Hadith

Anti-Slavery Speech (January 1852) http://books.google.com/books?id=SCpVAAAAYAAJ&pg=PA22 Published in The Works of Wendell Phillips, Street & Smith (1902), p. 22-23
1850s