It can only change if you change the way someone thinks.
But how is this done?
In the book of Mark it is made clear that the heart of humans is corrupt and that only evil can come from it.
Then how can you change the way someone thinks if only corruption can be found within them?
They must be willing to ask something better than themselves into their hearts, but what is it that can be better than a human?
Other people? No, for all humans are corrupt.
Laws made by humans? No, for it came from humans.
At this point many say then there is nothing left.
Sorry, wrong answer.
God is real, His teachings are real, His Son is real and He walked amongst us so that He could first hand understand just how corrupt we humans are.
He never sinned even though He felt their temptation. He died in our place. For every single person that wishes to accept Him as their Savior, and once they have done so we change. We are born again. Not into a new body, but within our very soul.
No longer is the self the top priority, but those about us are and only after God. For placing God first we understand that we must place all others before ourselves and when doing so the self becomes unimportant.
And so the world can start to change.
What is sad is that more and more refuse to listen to this. More and more embrace their own desires, their own lusts and so in some cases terrible thinks to place. Murders, theft, the killing of the innocent. All because most only think of and care only for themselves.
Selfishness is as the core of all the evils humans are capable of, and only Jesus Christ can change that and thus the world.
Turn from your sins, repent and turn away to live in sin no more and learn how to think in a new and glorious way that give honor unto the creator of everything — God.