Theists: How can predetermined fate and free will coexist?

[Neo-Scholastic]

To the OP, the a question cannot be answered apart from having a theory of time of which there are at least three: presentism, eternalism, and block theory. I have not committed to any particular philosophical position. Likewise, I am not convinced that natural science will ever be able to offer an adequate explanation since its necessary assumptions, like causal closure, operate within time. As for the Holy Scriptures, they appear to be neutral on the question. A couple of verses by Saint Paul are suggestive but that's about it;