A quotation from Thales?

A correspondent writes:

I have seen this statement all over the web referring to an alleged quote of Thales:

Megiston topos: hapanta gar chorei (Μέγιστον τόπος• άπαντα γαρ χωρεί)
“Space is the greatest thing, as it contains all things”

However, I have never seen a reference to an ancient text.  Is this a web myth?

The reference is to Diogenes Laertius, Lives of the philosophers, book 1, chapter 35:

Φέρεται δὲ καὶ ἀποφθέγματα αὐτοῦ τάδε·

πρεσβύτατον τῶν ὄντων θεός· ἀγένητον γάρ.
κάλλιστον κόσμος· ποίημα γὰρ θεοῦ.
μέγιστον τόπος· ἅπαντα γὰρ χωρεῖ.
τάχιστον νοῦς· διὰ παντὸς γὰρ τρέχει.
ἰσχυρότατον ἀνάγκη· κρατεῖ γὰρ πάντων.
σοφώτατον χρόνος· ἀνευρίσκει γὰρ πάντα.

Here are certain apothegms attributed to him:

Of all things that are, the most ancient is God, for he is uncreated.
The most beautiful is the universe, for it is God’s workmanship.
The greatest is space, for it holds all things.
The swiftest is mind, for it speeds everywhere.
The strongest, necessity, for it masters all.
The wisest, time, for it brings everything to light.[1]

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  1. [1]Loeb translation, vol. 1, p.37.