Should man do any less?
Should man--the reasoning creature, with intelligence to see, weigh, judge, appreciate,--alone be uncertain of the fatherly goodness of God; alone be unable to discern the wisdom and love behind all things?
Worry, therefore, is an evidence that we do not trust the all-fatherliness of God.
It is also the direct product of vanity, pride and self-conceit.

If these three qualities of evil in the human heart could be removed a vast aggregate amount of worry would die instantly.

No one can study his fellow creatures and not soon learn that an immense amount of worry is caused by these three evils.
We are worried lest our claims to attention are not fully recognized, less our worth be not observed, our proper station accorded to us.

How we press our paltry little claims upon others, how we glorify our own insignificant deeds; how large loom up our small and puny acts.

The whole universe centers in us; our ego is a most important thing; our work of the highest value and significance; our worth most inestimable.
The fact of the matter is most men and women are inestimable, their deeds of value, their lives of importance.