It can be said that God in the first creation of things decided to produce effects regularly in the presence of, and not in the absence of, certain things and each thing of the same species. And it belongs to these things to be a cause by their nature, i.e., by that nature in which they were constituted at their creation. And the term 'regularly' is used because God did not tie His power down to the creatures.

gabriel biel, whether the sacraments of the new covenant are effective causes of grace p. 4

When we see the world as an end in itself, everything becomes itself a value and consequently loses all value, because only in God is found the meaning (value) of everything, and the world is meaningful only when it is the 'sacrament' of God's presence. Things treated merely as things in themselves destroy themselves because only in God have they an life. The world of nature, cut off from the source of life, is a dying world. For one who thinks food in itself is the source of life, eating is communion with the dying world, it is communion with death. Food itself is dead, it is life that has died and it must be kept in refrigerators like a corpse.

alexander schmemann, for the life of the world, ch.1.3, p.17

Poetry transfigures that nature which ritual has freed from panic. But the world still is the world, where world wars, world riddles, world revolution, world chaos.

eugen rosenstock-huessy, fruit of lips, 1.1