We should make it a habit to exercise our minds, just same way we make it a habit to exercise our bodies (at least some of us try to). We should make it a habit to gather new ideas from sources other than our daily environment. The mind becomes withered, stagnant, narrow and closed unless it searches for new ideas.
For example, a farmer should go to the city often, and walk among the strange faces and the tall buildings. He will go back to his farm, his mind refreshed, with more courage and greater enthusiasm while a city man should take a trip to the country every so often and freshen his mind with sights new and different from those associated with his daily labors.
Everyone needs a change of mental environment at regular periods, the same as a change and variety of foods are essential. The mind becomes more alert, more elastic and more ready to work with speed and accuracy after it has been bathed in new ideas, outside of one’s own field of daily labor.
You should temporarily lay aside the set of ideas with which you perform your daily labors, and enter a field of entirely new (some even unheard-of) ideas. The outcome will be a new stock of ideas which will make you more efficient, more enthusiastic and more courageous, no matter what sort of work you may be engaged.
Do not be afraid of new ideas! They may just be the difference between success and failure.