Money talks. SAYING
said about people or organizations that are rich, and can therefore get or do what they want
Money doesn't grow on trees. SAYING
said to warn someone that they have to be careful how much money they spend, because there is only a limited amount:
"Mum, I'd like a new bike." "I'll have to think about it - money doesn't grow on trees, you know!"
Time is money. SAYING
said to emphasize that you should not waste time, because you could be using it to earn money
(from Cambridge Advanced Learner's Dictionary)