2 Nephi 32 – 33
The reason that there was no more doctrine of Christ that would be given until His coming is that what was given was so complete. They had the Law of moses prescribing their details of worship. They had been admonished to follow Christ by being baptized. They were then left with the counsel to follow what the Spirit would teach them when they had received the tongue of angels (the Holy Ghost) which would fill in the blanks for them. In our day it is equally simple. We are to observe the laws given us and make the covenants offered including baptism, priesthood, and temple covenants. We are then to endure to the end in following Christ and paying heed to the promptings of the Holy Ghost which we have been promised we will receive if we are failthful to whatever covenants we have made. Until we have made all the covenants the Holy Ghost will prompt us to keep the commandments and make the next covenant.