What you think is what you are...
Thinking isn't a waste of time. Perhaps it's the best use of your time - if you're thinking about the right things. Thinking cultivates creativity, inspiration, and, quite possibly, revelation and understanding. Do you want to be wise? Most of the Book of Proverbs was written by Solomon, who is considered to be the wisest man who ever lived. You can be as wise as Solomon Wisdom is the most important thing.