It is often the hardest bit of ourselves to be aware of, and acknowledge to ourselves!
Not unlike any personal change that we go through; we are often the last to see it, or even know that we've achieved it!
Everyone else knows; and sees it; but we are often unaware of our own achievements at personal development levels.
Best example: we get a new puppy; we are with the puppy every day; someone who we haven't seen for 3 months shows up and comments on the puppy .... "wow - hasn't Snoopy grown since we saw him last"!
We haven't really noticed the growth; not really ... it's just happening.
Courage, and our own personal growth, are often similar; we are often the last ones to see and feel it.