“Goodness is the only investment that never fails”- Henry David Thoreau

This quote is saying that doing good never fails no matter what you do because you could do good wherever you are and whenever you want. As long as you invest your time in it that is what matters.  If you invest your time in something that is going to do good you or to other people then you should do a good job on it and put effort into it. If you choose to invest your time in good stuff then you are doing something right and good for yourself. Being good is always going to be a good thing if you make it a good thing. If you want something to be good but you don't put the time and effort to make it right then it won’t benefit you. You have to try to make stuff good otherwise no one will do it for you. For example, if you are trying to do something nice for your friends birthday but you wait until last minute to do it then your plan won’t turn out as well as you wanted it. You weren't being or doing something good to make it good, you did it but you didn’t put time in it so it could turn out the right way. It’s always best to invest your time and energy in the good stuff that way you know what’s good and what’s wrong.