Then it cannot be like other, or like itself.
No.
Nor can it be affected so as to be other, for then it would be affected in such a way as to be more than one.
It would.
That which is affected in a manner other than itself or other, will be unlike itself or other, if sameness of affections is likeness.
True.
But the one, as appears, never having affections other than its own, is never unlike itself or other?
Never.
Then the one is never either like or unlike itself or other?
Plainly not.