こそ
Usage
こそ emphasis the preceding word, phrase or clause. When こそ is used, the particles は, が and を drop. "The very -; It is that -; in particular; precisely; definitely"
Examples
今年こそ日本に留学したいと思っている。
It is this year where I plan to study abroad in Japan.
サッカーの面白さはテレビで見ているだけでは分からない。スタジアムに行って実際に見てこそ本当の面白さが分かるのだ。
The excitement of soccer cannot be fully understood just by watching it on TV. It's only by going to the stadium and seeing it live that you can truly appreciate its fun