Read the passage from "song of myself." creeds and schools in abeyance, retiring back a while sufficed at what they are, but never forgotten, i harbor for good or bad, i permit to speak at every hazard, nature without check with original energy. in the passage, whitman uses the word to create positive feelings and associations with safety.

I would say the answer is "harbor". This word is usually used as a noun; but in this case, it is a verb that means to provide shelter to someone or something, to keep someone safe, but also to have something in mind and think about it. This word is purposefully chosen and fits into Whitman's well-intended, philanthropic and inclusive worldview.