Focusing too much on the day's news or temporary setbacks leads to pessimism and unbelief.
So it's far better to keep the bigger picture in mind.
According to that picture...
... Christ will have dominion from the River until the ends of the earth (Ps.72:8).
... His kingdom is growing little by little and will dominate the whole world (Mt.13:31-33).
... And the day is coming when so many will be streaming into the kingdom it will bring universal peace (Is.2:2-4).
With this picture before you, you can focus on your calling without worry... knowing also your labor isn't in vain.