sentences:  That wonderful operation of hypostatic abstraction by which we seem to create "entia rationis" that are, nevertheless, sometimes real, furnishes us the means of turning predicates from being signs that we think or think "through", into being subjects thought of.We thus think of the thought-sign itself, making it the object of another thought-sign.Thereupon, we can repeat the operation of hypostatic abstraction, and from these second intentions derive third intentions.