che sara sara

First constructed in the 16th century for English heraldic mottos, and notably quoted as che sera sera by Christopher Marlowe in his 1604 play Doctor Faustus (Act 1, Scene 1). From standard Italian quel che sarà, sarà (“what will be, will be”), ignoring the correct spelling and grammar (according to which a pronoun such as quel, quello or ciò is compulsorily needed at the very beginning of the sentence). Popularized by the 1956 song “Que Sera, Sera”, which adopted a Spanish-like spelling.

来源：wiktionary