Book of Mormon 121-122 Student Manual, p. 126; Ether 4:4-6; refer in this text to 2 Ne. 27:6-7, 11
“There is another truth regarding the relationship of doing (being obedient or keeping the commandments) and knowing (having the truth of the gospel made known to us through our application of it). This additional truth concerns the Lord’s practice of testing our hearts and minds relative to our new knowledge. He does this so that through our overcoming a trial, we will, in a sense, have the truth of the gospel indelibly stamped upon our souls. Our understanding and our heart become further purified, almost as gold—and our inner surety after having our trials will be rich. For example, the Lord instructs Mormon to not put certain information on the plates that we were to receive in the last days because it ‘is expedient … to try their faith, and if it so be that they shall believe these things then shall the greater things be made manifest unto them’ (3 Ne. 26:9).” (Kenneth Johnson, Ensign, Mar. 1995, pp. 10-11)