百里を行く者は九十を半ばとす

ひゃくりをゆくものはくじゅうをなかばとすhyakurioyukumonohakujuuonakabatosu

expression

1. don't count your chickens before they're hatched
2. there's many a slip 'twixt the cup and the lip
3. consider a journey of 100 ri to be halfway completed at 90

Study it in Yanamino