In old age he lost both his sight and his hearing. With all his active labours as a pastor, he had found time to keep up his early studies in theology and classics, and to store his mind with general information. To his hundredth year he could repeat long passages from favourite Latin authors, and regale himself with texts from the Hebrew as well as the Greek Scriptures. As Hebrew, strange to say, was no part of the curriculum of the Aberdeen College when he was a student, he became a self-taught Hebrew scholar, after the age of sixty, and acquired even a critical acquaintance with the language. He mastered German also, later in life.
