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.

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

benediction