there's many a slip twixt cup and lip

Etymology
See the detailed.

Proverb

 * 1) In any situation, however well planned, something can always go wrong.

Translations

 * Catalan: de prometre a complir hi ha molt a dir, de prometre a complir hi ha molt tros per penedir
 * Chinese:
 * Mandarin:
 * Finnish: moni asia voi mennä pieleen
 * French:
 * German:, freu dich nicht zu früh
 * Greek:
 * Ancient:
 * Italian: tra il dire e il fare c'è di mezzo il mare
 * Japanese:
 * Latin:
 * Russian: не говори́ «гоп», пока́ не перепры́гнешь
 * Scottish Gaelic: na cuir do làmh eadar a' chlach is an sgrath, eadar long is laimhrig
 * Spanish: de la mano a la boca desaparece la sopa, del dicho al hecho hay mucho trecho