Meaning of 肝心 in Japanese

Definition of 肝心

かんじん(kanjin) 【肝心 ·肝腎】

かんじんかなめ(kanjinkaname) 【肝心要】

(adj-na, n) the main point
そう言えば、肝心要の部分を何も決めていなかった。
Now that you mention it, I wasn't involved in the decision-making for the vital part.

そう言えば、肝心要かんじんかなめの部分ぶぶんを何もなにも決めていなかった。

Now that you mention it, I wasn't involved in the decision-making for the vital part.

We should try to be philosophical about life; wealth gained could also vanish.

始めが肝心かんじん。

A good beginning makes a good ending.

It is not what you read but how you read it that counts.

何事もなにごとも諦めが肝心かんじんだ。

Resignation is the first lesson of life.

何事もなにごとも最初さいしょが肝心かんじんだよな。

Whatever you're doing, starting off on the right foot is essential.

なんであれ物事ものごとの本体ほんたいを捕らえるとらえる事ことが肝心かんじんだ。

It is essential to get at the heart of the matter, no matter what they are.

Your plan sounds good, but the bottom line is: will it bring us more business?