1,Don't take no wooden nickels

2 Don't write a check your *** can't cash

3 A closed mouth doesn't get fed

4, Why buy a cow when you get the milk for free

5 You reap what you sew.

6 Absence makes the heart grow fonder.

7 Less is more.

8 Take it to the Grave.

9 No pain no gain.

10 You don't miss what you had until it's gone.

11 When it rains it pours

12 If it weren't for bad luck I wouldn't have no luck at all.

And there's many more.

I know you heard at least one of them.
what's the meaning behind these sayings ?

Does anyone know?