Objection: You say that nature is an instrument of freedom or spirit. Very well, so freedom or spirit has to account for some physical difference. But accounting for physical differences is exactly what energy does. So spirit must exert some sort of energy on the world. Taken in this way, your spirit is either an element in a physical system or causes no physical change.
Response: All physical theories have described nature as observer-dependent. Aristotle said that time required soul for its full logos; Newton and Einstein made motion and rest contingent on the observer’s stipulation of a background; and QM allows no natural entities except actually measured ones. What we call “nature” in any physical theory is not an absolute totality into which observers interrupt but a melange of subjective and objective factors. The activity of spirit is thus present from the beginning and physical law is realized only in what is constituted by spirit.
Said another way: to say we intervene in nature at some given time is to miss that time itself is already an objective-subjective melange. We’ve gotten so used to imagining time as a line or a division of the clockface that we forget that time requires counting (and act of the soul) from something remembered (another) to something either remembered, perceived, or anticipated. Separate places are both equally actual in a way separate times can never be. We can stretch the tape-measure across a surface and read the number at the end without having to remember where the hook-end is anchored, but time is not like this.
This why, even under the hypothesis that all of time is a single causal progression that is utterly determined, we are still free since the whole of time is must already be understood a constituted by spirit and so as able to be integrated with it. In constituting time, spirit can use any determined necessity to bring about a free action in the same way that it can use the necessity of an explosion to propel a bullet. The world at any given time has the structure it does because spirit needed it to be that way to attain its ends.