TAKOBOTO

not until, only after, of all things
Only after playing a sport you'll understand the fun of it.
「〜てはじめて」と同じ意味だ。

Add formation 

スポーツでもゲームでもじぶんでやってこそ、おもしろさがわかる。

You'll understand the fun of a sport or a game only after playing it.

にほんのぶんかは、にほんへいってこそわかるものだ。

Only once you visit Japan will you understand Japanese culture.

かのじょのどりょくでこそ、だいがくにごうかくできたのだ。

It was her efforts that made her pass the university.

"A" must be established for "B" to occur. Essentially a grammar point that establishes prerequisites.

benediction