You must learn all things, both the unshaken heart of persuasive truth, and the opinions of mortals in which there is no true warranty.
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Frag B 1.28-30, quoted by Sextus Empiricus, Against the Mathematicians, vii. 3; Simplicius, Commentary on the Heavens, 557-8; Proclus, Commentary on the Timaeus I, 345
There is one story left, one road: that it is. And on this road there are very many signs that, being, is uncreated and imperishable, whole, unique, unwavering, and complete.
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Frag. B 8.1-4, quoted by Simplicius, Commentary on the Physics, 144
Do not let habit, born from experience, force you along this road, directing aimless eye and echoing ear and tongue; but judge by reason the much contested proof which I have spoken.
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Frag. B 7.3-8.1, quoted by Sextus Empiricus, Against the Mathematicians, vii. 3
The only roads of enquiry there are to think of: one, that it is and that it is not possible for it not to be, this is the path of persuasion (for truth is its companion); the other, that it is not and that it must not be - this I say to you is a path wholly unknowable.
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Frag. B 2.2-6, quoted by Proclus, Commentary on the Timaeus I, 345
