Jesus Christ didn't tell us that our job is to focus on the secular world.

He commandment was that we love Him and love others that we come across, with all our heart, soul, mind, and strength. 

The changing of the world as it were will come about when the furnace of our own interior life with Him radiates warmth into the world around us, in little ways.

Through the 'salt' (charity) and light (truth) of Him.  

Being "little" is frankly objectionable to our pride.  We don't want little.  We want big and dramatic fixes here and here. 

But Our Lord has trouble 'working miracles" in us - when we focus on our goals outside of our love for Him. 

That's not nonsense...it's easy conclusions from Scripture.