FYI, it's spelled Douglass (just did not want you to get marked down on a paper or something)
Resilient
Intelligent
Persevering
Wiki can give you a good overview of him:
And here is one of three autobiographies he wrote (and in my opinion, though it's not the most refined, it's the best, because it was his first, written just a few years after he escaped slavery. At such a time is amazing):