According to his Biographer, "One of the most prominent characteristics of Dr. Spencer's preaching was its Scriptural character. He emphatically preached the Bible, the whole Bible, and nothing but the Bible. He drew every sermon from it. He grounded every sermon upon the plain import of God's revealed Word. He made that Word his sole authority in all his teaching. The Bible was the staple of all his sermons. They were full of it; and drew their inspiration from it. It was the simple power of Scripture truth that he wielded with so much effect. He had no confidence in any other kind of teaching. He believed that his sole business in the pulpit was to unfold and vindicate, enforce and apply the meaning or truths of God's revelation. Hence he aimed steadily to exalt the Divine Word. He bowed always and most reverently to its authority."