“Don’t you think it’s interesting that the greatest sermon Jesus ever preached there’s no mention of the cross? Jesus had the purpose in mind on the Sermon on the Mount to prepare men and women to receive what he would do on the cross and to prepare them by ruining their confidence in their own good works.
We are supposed to come to verse 48, to that statement, ‘you shall be perfect just as your Father in heaven is perfect’ and say “I can’t do that!’
So, what do we do? We look to the cross… Jesus says I did [lived perfectly] and if you put your trust in me I will give you the gift of my righteousness in your life. My righteousness will be yours.
We are supposed to regard it like this; ‘I thought I was a pretty good person until I heard Jesus really explain the law of God in the Sermon on the Mount. Now I know I really need a Savior.’ ” -David Guzick