[God] is your Father; pray to him. If your life is in disarray and you feel uncomfortable and unworthy to pray because you are not clean, don’t worry. He already knows about all of that. He is waiting for you to kneel in humility and take the first few steps. Pray for strength. Pray for others to be led to support you and guide you and lift you. Pray that the love of the Savior will pour into your heart. Pray that the miracle of the Atonement will bring forgiveness because you are willing to change. I know that those prayers will be answered, for God loves you. His Son gave his life for you. I know they will help you.”
Elder Richard G. Scott, Ensign, Nov. 1988, 77
Some of the brethren come to me and say, “Brother Brigham, is it my duty to pray when I have not one particle of the spirit of prayer in me?” True, at times, men are perplexed and full of care and trouble, their ploughs and other implements are out of order, their animals have strayed and a thousand things perplex them; yet our judgment teaches us that it is our duty to pray, whether we are particularly in the spirit of praying or not. My doctrine is, it is your duty to pray; and when the time for prayer comes, John should say, “This is the place and this is the time to pray; knees bend down upon the floor, and do so at once.” But John said, “I do not want to pray; I do not feel like it.” Knees get down, I say; and down bend the knees, and he begins to think and reflect. Can you say anything? Can you not say, God have mercy on me a sinner? Yes, he can do this, if he can rise up and curse his neighbor for some ill deeds. Now, John, open your mouth and say, Lord, have mercy upon me. “But I do not feel the spirit of prayer.” That does not excuse you, for you know what your duty is.
Brigham Young, Discourses of Brigham Young, 45.
Learn to pray. Pray often. Pray in your mind, in your heart. Pray on your knees. Prayer is your personal key to heaven. The lock is on your side of the veil. And I have learned to conclude all my prayers with “Thy will be done” (Matthew 6:10; see also Luke 11:2; 3 Nephi 13:10).
Elder Boyd K. Packer, “Prayer and Promptings,” Ensign, November 2009