A dictionary of Proverbs (Oxford Paperback Reference)

up see also FIRST up, best dressed; up like a ROCKET, down like a stick.
upright see EMPTY sacks will never stand upright.
USE it or lose it

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  1893 Homestead (Des Moines) 16 June USE OR LOSE (heading) It seems to be a law of nature that use is the condition of possession. 1948 Journal of American Judicature Society June (article title) The grand jury—use it or lose it. 1985 Times 18 Apr. 17 The conventional answer to this loss of facilities is that it is a problem for the local community which should be solved through ‘Use it or lose it’ campaigns and self­help solutions. 2007 New Scientist 28 Apr. 48 The pendulum swung back the other way in the 20th century, when a consumer-oriented culture lauded arousal and fulfilment: the injunction now was ‘use it or lose it’. ■ action and inaction
  

use (noun) see KEEP a thing seven years and you’ll always find a use for it.
vacuum see NATURE abhors a vacuum.
vain see in vain the NET is spread in the sight of the bird.
valet see NO man is a hero to his valet.
valour see DISCRETION is the better part of valour.
VARIETY is the spice of life
Cf. EURIPIDES Orestes 234 facial: ~. <^{f ,}‘^f, a change is always nice.

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  1785 COWPER TaskII. 76 Variety’s the very spice of life, That gives it all its flvour. 1854 ‘M. LANGDON’ Ida May vi. Takeall de wives you can get,—barietyam de spite of life. 1954 ‘M. COST’ Invitation from Minerva 174 ‘Your signal is different from ours?’.. ‘Vriety is the spice of life,’ he retorted. 2002 Washington Post 7 Aug. C15 (Broom Hilda comic strip)’I have prepared ourannual financial statement.’.. ‘Last year you chewed it up and swallowed it.’ ‘Variety, lads. Spice of life and all that!’ ■ novelty; variety