"Why do we need such resilient faith?"

The same reason the Pioneers did. "Because difficult days are ahead. Rarely in the future will it be easy or popular to be a faithful Latter-day Saint. Each of us will be tested. The Apostle Paul warned that in the latter days, those who diligently follow the Lord “shall suffer persecution.” That very persecution can either crush you into silent weakness or motivate you to be more exemplary and courageous in your daily lives." - Elder Russel M. Nelson

Let us prepare to stand in the face of persecution.  Let us be filled with faith and determination like the Pioneers.  Let us be modern-day pioneers and carry on. 

Firm as the mountains around us,
Stalwart and brave we stand
On the rock our fathers planted
For us in this goodly land—
The rock of honor and virtue,
Of faith in the living God.
They raised his banner triumphant—
Over the desert sod.

And we hear the desert singing:

Carry on, carry on, carry on!

Hills and vales and mountains ringing:

Carry on, carry on, carry on!

Holding aloft our colors,

We march in the glorious dawn.

O youth of the noble birthright,

Carry on, carry on, carry on!

Let us remember them on this Pioneer Day.  And let us strive to have resilient faith.