"The same as snow and fire?"
"By Jupiter! I do not."
"But heat is something different from fire, and cold something different from snow?"
"But this, I think, is apparent to you—that snow, while it is snow, can never, when it has admitted heat, as we said before, continue to be what it was, snow and hot; but, on the approach of heat, it must either withdraw or perish?"
"Certainly."
"And, again, that fire, when cold approaches it, must either depart or perish; but that it will never endure, when it has admitted coldness, to continue what it was, fire and cold?"
[121]. "You speak truly," he said.
"It happens, then," he continued, "with respect to some of such things, that not only is the idea itself always thought worthy of the same appellation, but likewise something else which is not, indeed, that idea itself, but constantly retains its form so long as it exists. What I mean will perhaps be clearer in the following examples: the odd in number must always possess the name by which we now call it, must it not?"
"Certainly."