Say I'm writing a book with three sections: A, B, and C. Say I am currently writing section B and I want to refer to things I wrote in sections C and A. How would that be written grammatically? Do I use past tense for A and future tense for C?
In section A we saw that blah blah blah. In section C we will see that blah blah blah.
Note that the text in question is intended to not necessarily be read in order. So even though by the laws of nature A comes before B comes before C, when reading the text the reader could technically read C before B before A without any problem in comprehension (hence my confusion as to tense usage in my case).