Whenever darkness fills our minds, we may know that we are not possessed of the Spirit of God. … When we are filled with the Spirit of God we are filled with joy, with peace, and with happiness, no matter what our circumstances may be; for it is a spirit of cheerfulness and of happiness. The Lord has given unto us the gift of the Holy Ghost. It is our privilege to have that Holy Ghost reign within us, so that from morning till night and from night till morning we shall have the joy, the light and the revelation thereof.
George Q. Cannon, in Brian H. Stuy, comp., Collected Discourses Delivered by President Wilford Woodruff, His Two Counselors, the Twelve Apostles, and Others, 5 vols. (1987–92), 4:137.