Emphasizes the importance or uniqueness of something or someone; 'precisely', 'exactly', 'it is...', 'of all...'.
Long explanation:
The ~こそ grammar point is used to emphasize the importance, uniqueness, or the most suitable thing or person in a specific situation. It can be translated as 'precisely', 'exactly', or 'it is...' in English. This grammar is often used with noun, な-adjective, or い-adjective.