This is likely to be an ongoing list. If you have any additions, explanations, or counterclaims, leave a comment and we will integrate it.
1. “It is the mark of an educated mind to entertain a thought without accepting it”
This is probably a willful twisting of something from the Nicomachean Ethics
Aristotle, Nicomachean Ethics, 1, 1094a24-1095a
“It is right that we ask [people] to accept each of the things which are said in the same way: for it is the mark of an educated person to search for the same kind of clarity in each topic to the extent that the nature of the matter accepts it. For it is similar to expect a mathematician to speak persuasively or for an orator to furnish clear proofs!
Each person judges well what they know and is thus a good critic of those things. For each thing in specific, someone must be educated [to be a critic]; to [be a critic in general] one must be educated about everything.”
τὸν αὐτὸν δὴ τρόπον καὶ ἀποδέχεσθαι χρεὼν ἕκαστα τῶν λεγομένων· πεπαιδευομένου γάρ ἐστιν ἐπὶ τοσοῦτον τἀκριβὲς ἐπιζητεῖν καθ’ ἕκαστον γένος, ἐφ’ ὅσον ἡ τοῦ πράγματος φύσις ἐπιδέχεται· παραπλήσιον γὰρ φαίνεται μαθηματικοῦ τε πιθανολογοῦντος ἀποδέχεσθαι καὶ ῥητορικὸν ἀποδείξεις ἀπαιτεῖν. ἕκαστος δὲ κρίνει καλῶς ἃ γινώσκει, καὶ τούτων ἐστὶν ἀγαθὸς κριτής. καθ’ ἕκαστον μὲν ἄρα ὁ πεπαιδευμένος, ἁπλῶς δ’ ὁ περὶ πᾶν πεπαιδευμένος.
2. “A Whole is greater than the sum of its parts”
This really popular misattribution may be a poor translation of the Metaphysics
Aristotle, Metaphysics 8.6 [=1045a]
“For however many things have a plurality of parts and are not merely a complete aggregate but instead some kind of a whole beyond its parts, there is some cause of it since even in bodies, for some the fact that the there is contact is the cause of a unity/oneness while for others there is viscosity or some other characteristic of this sort.
πάντων γὰρ ὅσα πλείω μέρη ἔχει καὶ μή ἐστιν οἷον σωρὸς τὸ πᾶν ἀλλ᾿ ἔστι τι τὸ ὅλον παρὰ τὰ μόρια, ἔστι τι αἴτιον, ἐπεὶ καὶ ἐν τοῖς σώμασι τοῖς μὲν ἁφὴ αἰτία τοῦ ἓν εἶναι, τοῖς δὲ γλισχρότης ἤ τι πάθος ἕτερον τοιοῦτον.
3. “Educating the mind without educating the heart is no education at all.” [and many variations thereof]
This one has absolutely no basis. Aristotle says many things about education, this just ain’t one of them.
4. “We are What we repeatedly do. Excellence is an act, not a habit.”
This one is has likely slipped into the Internet Aristotle Quotarium from Will Durant’s misconstruing of the Nicomachean Ethics. Indeed, this has been debunked more than a few times.
Here’s the closest Aristotle actually gets:
Aristotle, Nicomachean Ethics, 1105b
“It is therefore well said that a person becomes just by doing just things and prudent from practicing wisdom. And, no one could ever approach being good without doing these things. But many who do not practice them flee to argument and believe that they are practicing philosophy and that they will become serious men in this way. They act the way sick people do who listen to their doctors seriously and then do nothing of what they were prescribed. Just as these patients will not end up healthy from treating their body in this way, so most people won’t change their soul with such philosophy.”
εὖ οὖν λέγεται ὅτι ἐκ τοῦ τὰ δίκαια πράττειν ὁ δίκαιος γίνεται καὶ ἐκ τοῦ τὰ σώφρονα ὁ σώφρων· ἐκ δὲ τοῦ μὴ πράττειν ταῦτα οὐδεὶς ἂν οὐδὲ μελλήσειε γίνεσθαι ἀγαθός. ἀλλ’ οἱ πολλοὶ ταῦτα μὲν οὐ πράττουσιν, ἐπὶ δὲ τὸν λόγον καταφεύγοντες οἴονται φιλοσοφεῖν καὶ οὕτως ἔσεσθαι σπουδαῖοι, ὅμοιόν τι ποιοῦντες τοῖς κάμνουσιν, οἳ τῶν ἰατρῶν ἀκούουσι μὲν ἐπιμελῶς, ποιοῦσι δ’ οὐδὲν τῶν προσταττομένων. ὥσπερ οὖν οὐδ’ ἐκεῖνοι εὖ ἕξουσι τὸ σῶμα οὕτω θεραπευόμενοι, οὐδ’ οὗτοι τὴν ψυχὴν οὕτω φιλοσοφοῦντες.
5. “Knowing Yourself is the Beginning of all Wisdom”
No. I don’t even need to look this up. No. No. No. This is a version of the Delphic Oracles “know thyself” Γνῶθι σαυτόν. At least attribute it to Plato or Aristotle something. Or do what Diogenes Laertius does at give it to Pittakos (1.79.10)
6. “Whosoever is delighted in solitude, is either a wild beast or a god.”
This is almost Aristotle. It is mostly Francis Bacon (‘Essays’, XXVII “On Friendship” (1612, rewritten 1625). Aristotle said something not to far off, but still not this
Aristotle, Politics 1.2 1253a25–30
“It is clear that the state is naturally prior to each individual person. If each person when separated is not sufficient on his own, just as other parts are to the whole while a person who is incapable of joining commonwealth or does not need any part of a state because of self-sufficiency is either a beast or a god.”
ὅτι μὲν οὖν ἡ πόλις καὶ φύσει πρότερον ἢ ἕκαστος, δῆλον. εἰ γὰρ μὴ αὐτάρκης ἕκαστος χωρισθείς, ὁμοίως τοῖς ἄλλοις μέρεσιν ἕξει πρὸς τὸ ὅλον, ὁ δὲ μὴ δυνάμενος κοινωνεῖν ἢ μηθὲν δεόμενος δι᾿ αὐτάρκειαν οὐθὲν μέρος πόλεως, ὥστε ἢ θηρίον ἢ θεός.
7. “Where the needs of the world and your talents cross, there lies your vocation.”
This is total super-capitalist, corporate double-speak nonsense. It does not even remotely sound like Aristotle. I am not sure where it comes from and I cannot find it debunked, but I will kept looking
8. “Pleasure in the job puts perfection in the work.”
This one is likely a mistranslation or an attribution of a lost saying by Seneca in On Tranquility of mind. But I can’t really justify that by what I have found in the Seneca. Regardless, this is more neo-capitalist nonsense. I have a hard time believing this is anywhere in Aristotle.
9. “Well-begun is half done”
This is not really Aristotle. The idea is proverbial even when it is kind of quoted by Aristotle. But these words belong to someone else. Here is as close as Aristotle gets:
Aristotle, Politics 5, 1303b
“For the mistake happens in the beginning and the beginning is said to be half of the whole, so that even a minor mistake at the beginning is equal to those made at different stages.”
ἐν ἀρχῇ γὰρ γίγνεται τὸ ἁμάρτημα, ἡ δ᾿ ἀρχὴ λέγεται ἥμισυ εἶναι παντός, ὥστε καὶ τὸ ἐν αὐτῇ μικρὸν ἁμάρτημα ἀνάλογόν ἐστι πρὸς τὰ ἐν τοῖς ἄλλοις μέρεσιν.
This particular quotation comes from the Benjamin Jowett translation and is replicated on the wikiquote site. Aristotle in phrasing this as “it is said” (λέγεται) is marking the line as a proverb. Horace’s “The one who has begun has completed half the task.” dimidium facti, qui coepit, habet (Epistle 1.2) is closer to the popular version. Hesiod has “fool does not know that half is greater than the whole” ( Νήπιοι οὐδ’ ἴσασιν ὅσῳ πλέον ἥμισυ παντός:)