Blessed are the pure in heart: for they shall see God. Blessed are the peacemakers: for they shall be called the children of God. - Matthew 5:8
Beware of placing our Lord as Teacher first instead of Saviour. That tendency is prevalent to-day, and it is a dangerous tendency. We must know Him first as Saviour before His teaching can have any meaning for us, or before it can have any meaning other than that of an ideal which leads to despair. Fancy coming to men and women with defective lives and defiled hearts and wrong mainsprings, and telling them to be pure in heart! What is the use of giving us an ideal we cannot possibly attain? We are happier without it. If Jesus is a Teacher only, then all He can do is to tantalize us by erecting a standard we cannot come anywhere near. But if by being born again from above we know Him first as Saviour, we know that He did not come to teach us only: He came to make us what He teaches we should be. The Sermon on the Mount is a statement of the life we will live when the Holy Spirit is having His way with us.
Studies in the sermon on the mount. - by Oswald Chambers
Chambers, O. (1999, c1936). Notes on Jeremiah (electronic ed.). London: Oswald Chambers Publication Association, Ltd.
When witnessing we need to remember to tell the person that they must be born-again to understand the word of God. And that the bible it to be based on the whole bible not parts people pull out of context.