Here is one of my favorite scriptures:
“Wherefore, ye must press forward with a steadfastness in Christ, having a perfect brightness of hope, and a love of God and of all men. Wherefore, if ye shall press forward, and endure to the end, behold, thus saith the Father: Ye shall have eternal life.” (2 Nephi 31:20)
For me, being steadfast in Christ means doing what He said. It means obeying the commandments. It means serving others. In other words, it means being the obedient son and doing as He would do if He were in the same circumstances.
This is what I previously wrote after reading 2 Nephi 31: People Who Have Made A Great Impression On Me