"Now ideas may be divided variously into classes, as, for instance, ideas which are good, bad, or indifferent.

Or you may contrast the idea of Plato with ideas anything but platonic--take it as you please.

Then there is my idea, which is in itself, good, interesting, and worthy of the embalming process; and there is your idea, which I am human enough to consider altogether bad, worthless, and frivolous, for the plain and substantial reason that it is not mine.
Perhaps that is the best division of all.

Thine eye is necessarily, fatally, irrevocably evil, because mine is essentially, predestinately, and unchangeably good.

If I secretly adopt your idea, I openly assert that it was never yours at all, but mine from the beginning, by the prerogatives of greater age, wider experience, and immeasurably superior wisdom.