leap of faith

Etymology
Often attributed to, although he never used the exact wording.

Noun

 * 1)  The act of believing in something despite lack of proof of its truth or existence, or the attempt of something without being sure of its possible outcome.

Translations

 * Chinese:
 * Mandarin: 選擇相信, 信仰之躍
 * Finnish: uskon hyppy
 * French: acte de foi
 * Greek: τυφλή πίστη
 * Italian: atto di fede
 * Polish: skok wiary
 * Portuguese: salto da fé
 * Russian:
 * Spanish: salto de fe