A dictionary of Proverbs (Oxford Paperback Reference)

priest see ONCE a priest, always a priest; like PEOPLE, like priest.
prince see whosoever DRAWS his sword against the prince must throw the scabbard away; PUNCTUALITY is the politeness of princes.
problem see if you’re not part of the SOLUTION you’re part of the problem; a TROUBLE shared is a trouble halved.
PROCRASTINATION is the thief of time

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  1742 E. YOUNG Night Thoughts I. 18 Procrastination is the Thief of Time; Year after year it steals, till all are fled. 1850 DICKENS David Copperfield xii. Never do to­morrow what you can do to-day. Procrastination is the thief of time. 1935 O. NASH Primrose Path 100 Far from being the thief of Time, procrastination is the king of it. 2000 D. LINDSAY CuttingEdge of Barney Thomson xxi. 219 ‘Ach, well, ye know how it is,.. an’ so I procrastinated, I must admit. I know what ye must be thinking, laddie.. Procrastination is the thief of time, aye, isn’t that the truth.’ ■ procrastination
  

PROMISES, like pie-crust, are made to be broken

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  1681 Heraclitus Ridens 16 Aug. He makes no more of breaking Acts of Parliaments, than if they were like Promises and Pie-crust made to be broken. 1871 TROLLOPE Ralph the Heir II. iv. ‘Promises like that are mere pie-crust,’ said Ralph. 1981 Family Circle Feb. 66 Promises, like pie-crusts, they say, are made to be broken. Not at Sainsbury’s. Every single pie they sell lives up to the promise of its famous name. 2002 Oldie Aug. 26 Unhappily for most of those zillionaire twenty-somethings—and for those who invested in the New Economy they thought they had invented—their promises turned out to be piecrust. "deception
  

The PROOF of the pudding is in the eating
Proof means ‘test’ rather than the more normal ‘verification, proving to be true’.

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  с 1300 King Alisaunder (EETS) 1. 4038 Jt is ywrite that euery thing Hymself sheweth in the tastyng. 1623 W. CAMDEN Remains concerning Britain (ed. 3) 266 All the proofe of a pudding, is in the eating. 1666 G. TORRIANO Italian Proverbs 100 (note)Astheysay at the winding up, or the proof of the pudding is in the eating. 1738 SWIFT Polite Conversation ii. 132 The Proof of the Pudden is in the Eating. 1842 R. H. BARHAM Ingoldsby Legends 2nd Ser. 25 With respect to the scheme.. I’ve known soldiers adopt a worse stratagem. .. There’s a proverb however, I’ve always thought clever.. The proof of the Pudding is found in the eating. 1924 J. GALSWORTHY White Monkey III. xii. Let us.. look at the thing more widely. The proof of the pudding is in the eating. 1997 New Scientist 19 July 41 Lindzen for one argues that if the models get the detail wrong, they will get the big picture wrong, too. But modellers say the proof of the pudding is in the eating. ■ appearance; reality and illusion