The best is the enemy of the good.
Devil is in the details - The.
Ask no questions and hear no lies.
Hear all, see all, say nowt, tak' all, keep all, gie nowt, and if tha ever does owt for nowt do it for thysen.
There's safety in numbers.
You can't get blood out of a stone Link to proverb.
Many a true word is spoken in jest Link to proverb.