He's saying he's not a shallow person but feels and thinks deeply about spirituality.
Check these sites -- with a definition of soul -- and Langston Hughes explaining how he came to write this poem and reading the poem.
http://dictionary.reference.com/browse/soul
http://www.poets.org/viewmedia.php/prmMID/15722
In the peom The Negro Speaks of Rivers by Langston Hughes what does soul has grown deep like the rivers mean?
1 answer