Have a touch of the practical.
Not everything should be speculation; you must also act. The wisest are easiest to deceive: they may know extraordinary things, but they know nothing of life's ordinary necessities. The contemplation of sublime things keeps them from lowly, easy ones, and because they don't know the first thing about living -- an area where everyone else is so sharp -- they are either marveled over or considered ignorant by the superficial crowd.
So let the wise have a touch of the practical, enough not to be deceived and mocked. Know how to get things done: it may not be the highest thing in life, but it is the most necessary. What good knowledge if it isn't practical? These days true knowledge lies in knowing how to live -- Gracian