You can’t sing on Sunday, “O Babylon, O Babylon, [I] bid thee farewell” and then seek or tolerate its company again moments later

 The Lord, who “requireth the heart and a willing mind” (D&C 64:34) and who “is a discerner of the thoughts and intents of the heart” (D&C 33:1), knows why you go to church—whether you are present in body only or truly worshipping. You can’t sing on Sunday, “O Babylon, O Babylon, [I] bid thee farewell” and then seek or tolerate its company again moments later (“Ye Elders of Israel,” Hymns, no. 319). Remember that casualness in spiritual matters never was happiness. Make the Church and the restored gospel your whole life, not just a part of your outward or social life. Choosing this day whom you will serve is lip service only—until you actually live accordingly (see Joshua 24:15).

October 2014, Jorg Klebignat, "Approaching the Throne of God with Confidence"