Use it or lose it...?

Blog quote #1149... 
"Iron rusts from disuse; stagnant water loses it's purity and in cold weather becomes frozen; even so does inaction sap the vigor of the mind."  -Leonardo DaVinci-    

Use it or lose it. If you rest you rust. Things in motion tend to stay in motion. An active mind, is a lively mind. 

For best results, keep challenging the brain as often as possible. It's an amazing organ that can handle far more than we perceive!  

That's my view...what say you?