"Iron rusts from disuse;
water loses its purity from stagnation,
even so does inaction sap the vigor
of the mind."
~ Leonardo daVinci
Alcohol Ink on Yupo paper
"Use it or loose it" is a common phrase used to express what Leonardo was talking about here. I believe that as we age, we must work even harder than we did in our youth to stay in shape; physically and mentally. We should try to experience new things and challenge ourselves in body and spirit everyday. It is all too easy to get cynical, complacent and set in our ways and use the words; "I can't (Fill in the blank)". Those words are a jail sentence to continued evolution, fulfillment and enlightenment. Often, I think "I can't" really means "I am too lazy, tired or disinterested to really work at something". When we stop learning new things, our mental growth stagnates. When we stop exercising, our physical strength and stamina deteriorates. It's a simple law of nature. Use the abilities you were given and constantly work to improve your gifts. If you do, your life will be enriched with vigor and knowledge for having made the effort.