Often attributed to Plato, it cannot be found in any of his writings. http://languagelog.ldc.upenn.edu/nll/?p=796
Misattributed
Plato: Making
Plato was Classical Greek philosopher. Explore interesting quotes on making.
275c, as translated by Joe Sachs in introduction to Aristotle's Physics: A Guided Study (2011), p. 1
Phaedrus
Gorgias
38b, as quoted by R. D. Archer-Hind, The Timaeus of Plato (1888)
Timaeus
Socrates speaking to Alcibiades
Alcibiades I
“No one should be discouraged, Theaetetus, who can make constant progress, even though it be slow.”
Original Greek, from Sophist 261b http://www.perseus.tufts.edu/hopper/text?doc=Perseus%3Atext%3A1999.01.0172%3Atext%3DSoph.%3Asection%3D261b: θαρρεῖν, ὦ Θεαίτητε, χρὴ τὸν καὶ σμικρόν τι δυνάμενον εἰς τὸ πρόσθεν ἀεὶ προϊέναι.
Also quoted in variant forms such as: Never discourage anyone who continually makes progress, no matter how slow
Sophist
555c, G. Grube and C. Reeve, trans., Plato: Complete Works (1997), p. 1166
The Republic
37c–38b, as quoted by R. D. Archer-Hind, The Timaeus of Plato https://books.google.com/books?id=q2YMAAAAIAAJ (1888)
Timaeus
Often attributed to Plato, it cannot be found in any of his writings ( see this http://languagelog.ldc.upenn.edu/nll/?p=796). The quote is attributed to Plato in A Dictionary of Thoughts: Being a Cyclopedia of Laconic Quotations from the Best Authors of the World, Both Ancient and Modern (page 560) by Tryon Edwards.
Misattributed
296d-297b
Statesman