How to be smart?

i will quote something i just read:
:In your career knowledge is like a carton of milk-it has a shelf life and if you are not replacing everything you know every couple of years, then your career is going to turn sour-just like a cartoon of milk. " Jeane C Meister.

I sometimes complain (to myself) of how boring my life, about loneliness i felt, eventhough i know that fact: lot of new things to be seen and learned. We shouldnot be bored of life. Our Creator is too damn marvellous, His creation is unlimited, interesting and beaautiful in its nature.
In the above quotation by Jeanne, she limits the topic in the career, but actually it goes beyond that, at least for my understanding, new things to be seen, we should learn about ALL. Just like a little boy, full of curiosity and always be active, shouldnot we follow his attitude towards life. Change and adapt yourself, be creative and positive. Invite more ideas and new thought, do not ever think that you have enough, always be ready to change and be humble to acknowledge your mistake. Learn from others.