ключ к

key to

→ ключ
phrase Rare #34,352
key to Used literally for a key that opens something and figuratively for something that enables or leads to a result. The noun after «к» is in the dative case.
RU: Терпение — ключ к успеху.
EN: Patience is the key to success.

Вера в себя — ключ к успеху.

Believing in yourself is the key to success.

Он подобрал ключ к старому замку.

He picked up the key to the old lock.

Оптимизм-ключ к счастливой жизни.

Optimism is the key to a happy life.