The phrase "all existing things" is correct and usable in written English.
It can be used when referring to everything that currently exists, often in philosophical or scientific discussions.
Example: "In the grand scheme of the universe, all existing things are interconnected in ways we are only beginning to understand."
Alternatives: "everything that exists" or "all that is present".
In chapter 3 Anselm argues that all existing things exist through some one thing.
There is, then, either some one thing through which all existing things exist, or there is more than one such thing.
Let us divide all existing things into two, or rather, if you do not object, into three classes.
Thus, all existing things must "pay penalty and retribution to one another for their injustice, according to the disposition of time," as he rather figuratively expressed it.
Anselm had said, for example, that "the supreme Nature is more appropriately said to be everywhere, in this sense, that it is in all existing things, than in this sense, namely that it is merely in all places" (Monologion, 23).
This fire or God, containing the seminal reasons (rationes seminales), ideas or forms of all existing things, is a Lipsian innovation, deriving from the Neoplatonic and Christian traditions (he quotes John of Damascus, De orthodoxa fide 13).
For actualists, however, who categorically reject any such distinction, NE can mean only that all actually existing things are necessarily actual and NNE that anything that could have existed already does.
But given the second conjunct, any such object a is distinct from all actually existing things.
(For example, suppose C is the set of all contingently existing things wholly distinct from Obama.
The only two per se entities are body and void; all other existing things are inseparable or accidental properties of these (Lucretius' own terms for which are coniuncta and eventa respectively).
When modern art brought sculpture down from its traditional pedestal, it entered into an often self-defeating combat with buildings, trees, people, and all other regularly existing things.
