…we cannot expect to be always happy, and that to know how to be patient is most useful. For there are few days in our lives which do not give us the opportunity to learn greater patience.
You want to see a very busy man to ask him something. You go to his house. Already many visitors are there and he keeps you waiting a very long time before seeing you. You stay there quietly, perhaps for several hours. You are patient.
Another time, the person you wish to see is not at home when you arrive. You return again the next day, but his door is still closed. You go back a third time, but he is sick and cannot see you. You let a few days go by and then return once more. And if something new again prevents you from meeting him, nevertheless you are not discouraged, but renew the attempt until at last you see him. This kind of patience is called perseverance.
Perseverance is an active patience, a patience that marches on.
Ref: Words of Long Ago