“God hath set his hand and seal to change the times and seasons, and to blind their minds, that they may not understand his marvelous workings; that he may prove them also and take them in their own craftiness;”
Original Source
Doctrine & Covenants 121:12
https://www.lds.org/scriptures/dc-testament/dc/121.12?lang=eng&clang=eng#p11
Accessed 04/08/2018