What does the phrase 'speak of' mean?

Question

In this following context, what does the phrase ''speak of'' mean?

I found thi definitions of ''speak of'' as: ''serve as evidence for something. (Oxford Languages)

''speak of something) to seem to prove that something exists or is true'' (Macmillan Dictionary)

Should I use this meaning in this context?

the context:

But where there is no real unchanging entity, no soul, there one cannot speak of the transmigration of such a thing.

Source: Page. 8 ''Fundamentals of Buddhism'' by Nyanatiloka Mahåthera

Answer 1

I think the quotation can be paraphrased as

If there is no soul then one cannot prove the existence of transmigration.

So the second definition, Macmillan, seems to fit the quote better.