In this sestet from Sonnet VII by John Milton, the act of putting his trust in God allays his worries about his progress because he sees that he will arrive in life where he is meant to, when he is meant to.
He thinks that sooner or later, everything will fall into place. He relies that the proper time will come, because God wants it that way and he trusts God.
He doesn't have to do anything, it just will fit when it has to.
They are not synonyms of each other, but both are used as synonyms of the word "unbiased." Each word has a very broad meaning, and the meanings only intersect when describing an unbiased opinion or view.
