There are so many people who would quote you the Sermon on the Mount and tell you that it is instructions for Christian living.
It is not. It is to expose the righteousness of the Pharisees.
The Sermon begins this way.
For I tell you, unless your righteousness exceeds that of the scribes and Pharisees, you will never enter the kingdom of heaven.
And ends like this.
But seek first the kingdom of God and his righteousness, and all these things will be added to you.
So when Jesus came to the part about building the house on the rock and not on sand, he was speaking about asking for the Father’s righteousness instead of the Pharisee’s righteousness.
If you then, who are evil, know how to give good gifts to your children, how much more will your Father who is in heaven give good things to those who ask him!
Many people think the Father’s righteousness to think that which was taught by Jesus in those chapters.
He actually said it was not a performance based righteousness. It was rather a righteousness based on a gift.
This what Paul said.
This righteousness is GIVEN through faith in Jesus Christ to all who believe. There is no difference between Jew and Gentile,
It’s a gift.
So, the theme of the Sermon on the Mount is to seek that gift.
Sadly people turn the same into a series of “doing”. That’s why today Christians have problems with people of other faith or people who are worse than them (in their opinion) being reconciled to God after their death.
Have a great 2018.