If you will not humble yourself and ask for this to be made known to you, then you cannot be brought into the light. Then the only result will be to perish in the dark.
If you will follow the steps with the required real intent, acting no deception before God as you do, then you will receive the Holy Ghost. It will be unlocked to tell you what you lack and what you need to do. This inner light is a powerful source which can literally tell "you all things what ye should do."
Nephi is both pleading and warning in these two verses. He wants you to go to the source and be directed from there. To have the words of Christ available to you. To hear the words of angels as you draw near to the light. If you do not, then it is because you refuse to follow the steps he has described.