But his delight is in the law of the Lord, and in His law he meditates day and night.—Psalm 1:2
To think God's thoughts requires much prayer. If you do not pray much, you are not thinking God's thoughts. If you do not read your Bible much and often and reverently, you are not thinking God's thoughts....
There also has to be a lot of meditation. We ought to learn to live in our Bibles. Get one with print big enough to read so it does not punish your eyes. Look around until you find a good one, and then learn to love it. Begin with the Gospel of John, then read the Psalms. Isaiah is another great book to help you and lift you. When you feel you want to do it, go on to Romans and Hebrews and some of the deeper theological books. But get into the Bible. Do not just read the little passages you like, but in the course of a year or two see that you read it through. Your thoughts will one day come up before God's judgment. We are responsible for our premeditative thoughts. They make our mind a temple where God can dwell with pleasure, or they make our mind a stable where Christ is angry, ties a rope and drives out the cattle. It is all up to us. Rut, Rot or Revival: The Condition of the Church, 42.
"My thoughts aren't adequate, Lord, to enable me to lead Your people through the quagmire of today's society. Nor are the thoughts of the writers, the teachers, the preachers, and the psychologists that bombard me from the pages and the airways. I'm only going to be effective as a spiritual leader as I learn to 'think God's thoughts.' Amen."