Besides that is the age when one begins to know life's obligations, and if one does not know them even then, one has not learnt anything. To know one's obligation towards those who look up to one, who surround one, who expect some help, some advice, some service from one, that is the time when one must be conscious of these things. It is the beautiful age when the tree comes to full maturity, when it begins to give fruit to the world. Not only is this the time for the singer when his voice is in full blossom, not only is this the time for the artist or the thinker when he can express himself fully, but for every person that age is the promise of the ripened mind expressing itself to the best advantage; and if that opportunity is not taken then man has missed a great deal in life.