Goodness is the only investment that never fails. 

Henry david thoreau

What i understand about this quote is that goodness is the only investment that will not fail you. If you invest in being good, your investment will not fail you. You will succeed in life you will be great. You will do nothing but good. You will never fall in life if you choose the right. You will be persuade. You will be a good person that everyone will look up to you. You have to show others what you are made of so you are like by others. Once you stop being good your investment will fail, you will not get what you want.