Whether God loves all things?
It seems that God does not love all things.
On the contrary, It is said (Wisdom 11:25): “Thou lovest all things that are, and hatest none of the things which Thou hast made.”
I answer that, God loves all existing things. For all existing things, in so far as they exist, are good, since the existence of a thing is itself a good; and likewise, whatever perfection it possesses. Now it has been shown above (Question 19, Article 4) that God’s will is the cause of all things. It must needs be, therefore, that a thing has existence, or any kind of good, only inasmuch as it is willed by God. To every existing thing, then, God wills some good. Hence, since to love anything is nothing else than to will good to that thing, it is manifest that God loves everything that exists. Yet not as we love. Because since our will is not the cause of the goodness of things, but is moved by it as by its object, our love, whereby we will good to anything, is not the cause of its goodness; but conversely its goodness, whether real or imaginary, calls forth our love, by which we will that it should preserve the good it has, and receive besides the good it has not, and to this end we direct our actions: whereas the love of God infuses and creates goodness.
We love a thing when we perceive good in it. Our love for things is a reaction to the good we perceive already existing in them.
With God it is different.
God puts the good that we perceive in the thing in the thing. For us, perceiving the good in things and reacting to that good by loving the thing, is ultimately a passive reaction. Whereas God is active in putting the good in a thing where before no good existed.
This, for a Catholic, is what makes God God.