The wise hand does not all the tongue dictates.
Faint heart ne'er won fair lady.
Abundance, even of good things, prevents them from being valued
Well, now there's a remedy for everything except death.
Too much sanity may be madness and the maddest of all, to see life as it is and not as it should be.
I believe there's no proverb but what is true; they are all so many sentences and maxims drawn from experience, the universal mother of sciences.