To be yourself in a world that is constantly trying to make you something else is the greatest accomplishment.
Successful is the person who has lived well, laughed often and loved much, who has gained the respect of children, who leaves the world better than they found it, who has never lacked appreciation for the earth's beauty, who never fails to look for the best in others or give the best of themselves.
The purpose of life is not to be happy. It is to be useful, to be honorable, to be compassionate, to have it make some difference that you have lived and lived well.