15 For we have not an high priest which cannot be touched with the feeling of our infirmities; but was in all points tempted like as we are, yet without sin.
There is a big difference between academic knowledge and applied knowledge. You can learn about and thing by someone telling you about it. But to experience that thing is a very different kind of knowledge. I can tell you about my home town Kanab, Utah. But if you never visit it, you never see it’s red rocks and beautiful views, you will never really “know” what it’s like.
In the same way, we all have what the scriptures call “infirmities” or weaknesses and we all experience this mortal life in a way that could not just be taught in a classroom. I has to be experienced. We are taught both by Paul in the New Testament (see the quote from Hebrews above), and more fully by Alma in the Book of Mormon that Jesus Christ did not only come to save us from our sins, but also to help our weaknesses.
Jesus really took upon himself all the weaknesses of mortality. He experienced these weaknesses first hand. He even was “in all points tempted like as we are.” But He did not give into temptation. Beyond our sins, his atonement atoned for our infirmities says Alma:
Alma 7:12
12 And he will take upon him death, that he may loose the bands of death which bind his people; and he will take upon him their infirmities, that his bowels may be filled with mercy, according to the flesh, that he may know according to the flesh how to succor his people according to their infirmities.
He did this so he could completely know what each of us are going through. He doesn’t just know in an academic way, but He really does “know” in an applied way. He know’s exactly how you feel. His doesn’t just have sympathy for you, but empathy. He loves you. His grace is sufficient for you, and your weaknesses. All you have to do is have faith in Him (Hebrews 11:6) , repent when you falter (revelation 2:5), make and keep covenants to keep his commandments (Romans 6:4), receive the Holy Ghost (Acts 8:17), and endure to the end. (Hebrews 3:14)
In the name of Jesus Christ, Amen.