Observation.
The number of men who go through life with their eyes closed is astonishing. These men regret their want of luck, they say they have had no chances; alas! they have had their chances but either failed to see them, or lacked the courage or capacity to take advantage of them.
The world is so constituted that changes are ever taking place, and every change is fruitful of opportunities. We hear it said of some that everything they touch turns into gold. It is only another way of saying that they are ever on the look-out for opportunities, and are not laggards in turning them to good account.