We struggle with wrong thinking because we think wrong.  Due to the environment we live in, we are susceptible to the negative input from the world system.  What goes in comes out.  The devil tries hard to keep us in the dark about the things of God. He is always trying to set up barriers between God and us.  It is hard to think like Jesus if we constantly allow ourselves to be influenced by the world.  That is way we need to thank God for the Holy Ghost.  He will help us to get into the right mindset.