Not P but Moby-Dick (57)

[Mike Jing]

>From Chapter 80:

This august hump, if I mistake not, rises over one of the larger vertebræ,
and is, therefore, in some sort, the outer convex mould of it. From its
relative situation then, I should call this high hump the organ of firmness
or indomitableness in the Sperm Whale.  And that the great monster is
indomitable, you will yet have reason to know.

What does "you will yet have reason to know" mean?