Whoso Remembereth These Sayings of Mine and Doeth Them, Him Will I Raise Up at the Last Day

After teaching the principles of what has come to be known as the Sermon on the Mount (found, for example, in Matthew 5-7 of the New Testament) to a group of the descendants of Lehi somewhere in the Americas, Christ reiterates their value as foundational spiritual truth.

“And now it came to pass that when Jesus had ended these sayings he cast his eyes round about on the multitude, and said unto them: Behold, ye have heard the things which I taught before I ascended to my Father; therefore, whoso remembereth these sayings of mine and doeth them, him will I raise up at the last day.” (3 Nephi 15:1)

Questions:

-How important is it to remember and do what Christ taught in His Sermon on the Mount (which he again taught to the descendants of Lehi)?