Crime doesn't pay

If you engage in illegal activities, you will not make money in the long run.

Garbage in, garbage out | GIGO

Incorrect or bad input results in incorrect or bad output.

If it ain't broke, don't fix it

If something is not faulty or damaged, don't try to repair it.

If you pay peanuts, you get monkeys

An employer who pays low wages will have bad staff.

Make love not war

1) Sex between people is better than fighting between countries. 2) Peace is better than war.