noun
fruits of one's labour; reward of hard work
Idiomatic expression likening the results of hard work to crystals formed from sweat. Often used in motivational or poetic contexts.
この成功はまさに汗の結晶だ。
This success is truly the fruit of our hard work.
彼の作品は長年の汗の結晶と言
His work can be called the crystallization of years of effort.