there's many a slip twixt the cup and the lip

Proverb

 * 1) * 1925-29, (translator),, , Part I, chapter xi:
 * With the blessings of my elders, I started for Bombay. This was my first journey from Rajkot to Bombay. My brother accompanied me. But there is many a slip, twixt the cup and the lip. There were difficulties to be faced in Bombay.
 * With the blessings of my elders, I started for Bombay. This was my first journey from Rajkot to Bombay. My brother accompanied me. But there is many a slip, twixt the cup and the lip. There were difficulties to be faced in Bombay.