Dallin H. Oaks
"The viewing of signs or miracles is not a secure foundation for conversion. Scriptural history attests that people converted by signs and wonders soon forget them and again become susceptible to the lies and distortions of Satan and his servants. (Hel. 16:23; 3 Ne. 1:22, 2:1, 8:4.) 'How long will this people provoke me?' the Lord said to Moses, 'and how long will it be ere they believe me, for all the signs that I have shewed among them?' (Num. 14:11.)
"Jesus made a triumphal entry into Jerusalem, but John records in sadness, 'Though he had done so many miracles before them, yet they believed not on him.' (John 12:37.)
"In contrast to the witness of the Spirit, which can be renewed from time to time as needed by a worthy recipient, the viewing of a sign or the experiencing of a miracle is a one-time event that will fade in the memory of its witness and can dim in its impact upon him or her. For example, as President Kimball observed, 'Oliver Cowdery saw many signs. He handled the sacred plates; saw John the Baptist; received the higher priesthood from Peter, James, and John, and was the recipient of many great miracles, and yet they could not hold him to the faith.'" (The Lord's Way, p. 87)
Neal A. Maxwell
"How quickly [Satan] moves in even where people have had special spiritual experiences, seeking to get people who have seen signs 'To disbelieve all which they had heard and seen.' (3 Nephi 2:1-2.) The adversary has a better chance to persuade us that what we believe is foolish if we worry about looking foolish in front of our fellowmen. We read about the subtleties of the devil and that the adversary persuadeth not one man to do good. (Alma 12:4; Moroni 7:17.)" (Things As They Really Are, p. 41)