When we invite the Holy Ghost to fill our minds with light and knowledge, He "quickens" us, that is to say, enlightens and enlivens the inner man or woman. As a result we notice a measurable difference in our soul. We feel strengthened, filled with peace and joy. We possess spiritual energy and enthusiasm, both of which enhance our natural abilities. We can accomplish more than we otherwise could do on our own. We yearn to become a holier person.
Each of us knew that the journey to exaltation would be long, strenuous, and sometimes lonely, but we also knew that we would not travel alone. Heavenly Father provides all who fulfill the prerequisites of faith, repentance, and baptism with a companion and guide, the Holy Ghost.
The path to eternal life is not on a plateau. Rather, it is an incline, ever onward and upward. Hence, ever-increasing spiritual understanding and energy are required to reach our destination. Because the pernicious opposition by Satan continues, the continuous enlightened guidance of the Holy Ghost is absolutely essential.