Full Idea
Some argue that compared to sets, the identity conditions for properties are obscure, and so properties, including realist depictions of them, should be rejected.
Gist of Idea
We should abandon the concept of a property since (unlike sets) their identity conditions are unclear
Source
J.P. Moreland (Universals [2001], Ch.6)
Book Reference
Moreland,J.P.: 'Universals' [Acumen 2001], p.116
A Reaction
I have never thought that difficulty in precisely identifying something was a good reason for denying its existence. Consider low morale in a work force. 2nd thoughts: I like this!