  One vital passage for distinction (1) is 181b–183b. If Unitarianism is right, this passage should be an attack on the Heracleitean thesis that everything is in flux, but not an attack on the Heracleitean thesis that the objects of perception are in flux. According to Unitarians, the thesis that the objects of perception are in flux is a Platonic thesis too. Readers should ask themselves whether this is the right way to read 181b –183b.