人事を尽くして天命を待つ でしょうかね？ Sorry I am not very sure.

hey!! did you see "hana kimi" ? that's very nice! i have recently watch it too... well, i know i'm not helping you with your question jejeje xD i'm trying to learn japanese too. I just get exciting when i read the lines of Sano Izumi-kun... well... bye xD

How about these? "Hard work will definitely be rewarded" 努力は必ず報われる or 努力は決して裏切らない "The rest is to believe in yourself" あとは自分を信じるだけです　or 要は自分を信じられるかどうかです（自分を信じなさい）