負まけに不ふ思し議ぎの負まけなし

expression

there are no mysterious losses; defeat always has a reason

Proverb meaning that losses or failures are never without cause; one should reflect on the reasons for defeat rather than attributing it to bad luck. Often contrasted with 勝ちに不思議の勝ちあり (wins can sometimes be inexplicable).

See also: 勝ちに不思議の勝ちあり、負けに不思議の負けなし

• 試し合あいに負まけたのは、練れん習しゅう不ぶ足そくだったからだ。負まけに不ふ思し議ぎの負まけなしというだろう。

  We lost the match because we didn't practice enough. As they say, there are no mysterious losses.