1. The sentences are sensible. 2. The 'S's shouldn't be used. You used the word "should" and it made the sentences become an imperative form (commanding/ giving instructions or advice) therefore the verbs (arrive and realize) should just be in its original form (not tensed). Example. He should go (correct) He should goes (incorrect) She should buy the book (correct) She should buys the book (incorrect) ** I am not an expert :) but I hope this helps.

It could make some sense this way: Your mind should fly, and 'it' arriveS to summits of doubt and realizeS that between horizons of trusts, belief and atheism are nearby each other I guess this is what the writer was trying to pass across.