The other cliché goes like this: 'Live each day as if it were your last.' The best way to take this as advice is to do exactly the opposite. Live each day as if you will live forever. That means, first and foremost, that you should treat the people around you as if they too will be around for a very long time to come. The choices that you make today matter, because their consequences will grow greater and greater.
That is what Einstein was getting at when he supposedly said that compound interest is the most powerful force in the universe. This isn’t just about finance or money, but it’s about the idea that you’ll get the best returns in life from investing your time in building durable friendships and long-lasting relationships.