“He said that there was one only good, namely, knowledge; and one only evil, namely, ignorance.”

— Diogenes Laërtius

Socrates, 14.
The Lives and Opinions of Eminent Philosophers (c. 200 A.D.), Book 2: Socrates, his predecessors and followers

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Diogenes Laërtius 107

biographer of ancient Greek philosophers 180–240

Related quotes

“There is only one good, knowledge, and one evil, ignorance.”

Socrates (-470–-399 BC) classical Greek Athenian philosopher

Socrates II: xxxi http://www.perseus.tufts.edu/hopper/text?doc=D.+L.+2.5.31&fromdoc=Perseus%3Atext%3A1999.01.0257#note-link14. Original Greek: ἓν μόνον ἀγαθὸν εἶναι, τὴν ἐπιστήμην, καὶ ἓν μόνον κακόν, τὴν ἀμαθίαν
Diogenes Laertius
Variant: The only good is knowledge and the only evil is ignorance.

“The only good is knowledge, and the only evil is ignorance.”

Herodotus (-484–-425 BC) ancient Greek historian, often considered as the first historian

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

“A philosopher worthy of the name has never said more than a single thing: and even then it is something he has tried to say, rather than actually said. And he has said only one thing because he has seen only one point: and at that it was not so much a vision as a contact…”

Henri Bergson book An Introduction to Metaphysics

Un philosophe digne de ce nom n'a jamais dit qu'une seule chose : encore a-t-il plutôt cherché à la dire qu'il ne l'a dite véritablement. Et il n'a dit qu'une seule chose parce qu'il n'a su qu'un seul point : encore fut-ce moins une vision qu'un contact...
"L’intuition philosophique (Philosophical Intuition)" http://obvil.paris-sorbonne.fr/corpus/critique/bergson_pensee/body-5 (10 April 1911); translated by Mabelle L. Andison in: Henri Bergson, The Creative Mind: An Introduction to Metaphysics, Courier Dover Publications, 2012, p. 91

“Truth is one; only It is called by different names.”

Ramakrishna (1836–1886) Indian mystic and religious preacher

Source: The Gospel of Sri Ramakrishna (1942), p. 423
Context: Truth is one; only It is called by different names. All people are seeking the same Truth; the variance is due to climate, temperament, and name. A lake has many ghats. From one ghat the Hindus take water in jars and call it "jal". From another ghat the Mussalmāns take water in leather bags and call it "pāni". From a third the Christians take the same thing and call it "water". Suppose someone says that the thing is not "jal" but "pāni", or that it is not "pāni" but "water", or that it is not "water" but "jal", It would indeed be ridiculous. But this very thing is at the root of the friction among sects, their misunderstandings and quarrels. This is why people injure and kill one another, and shed blood, in the name of religion. But this is not good. Everyone is going toward God. They will all realize Him if they have sincerity and longing of heart.