“True, but the strength of god is mightier still,
And oft, in direst strait,
It lifteth from the lowest depths of ill
Him who, with cloud-veiled eyes, was desperate.”
Source: Seven Against Thebes (467 BC), lines 226–229 (tr. Anna Swanwick)
Original
Ἔστι· θεοῦ δ᾽ ἔτ᾽ ἰσχὺς καθυπερτέρα· πολλάκι δ᾽ ἐν κακοῖσι τὸν ἀμάχανον κἀκ χαλεπᾶς δύας ὕπερθ᾽ ὀμμάτων κρημναμενᾶν νεφελᾶν ὀρθοῖ.
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Aeschylus 119
ancient Athenian playwright -525–-456 BCRelated quotes

“Thoughts are mightier than strength of hand.”
Fragment 854.
Phædra

VI, 4
The Persian Bayán

Pithy Aphorisms: Wise Saying and Counsels, Edited by Mansoor Limba, Tehran: The Institute for Compilation and Publication of Imam Khomeini’s Works -- International Affairs Department, p. 6.
Theology and Mysticism

“He who controls others may be powerful, but he who has mastered himself is mightier still.”
Variant: He who conquers others is strong; He who conquers himself is mighty.

“Star of resplendent front! Thy glorious eye
Shines on me still from out yon clouded sky.”
Arcturus (To Edgar Allan Poe).
Bartlett's Familiar Quotations, 10th ed. (1919)

“Clouds signify the veil of the Most High.”
Source: Seraphita (1835), Ch. 3: Seraphita - Seraphitus.

Epistle to Muhammad Sháh

“Sweet is the god but still I am
in agony and far from my strength.”
The Willis Barnstone translations, Dream