James Reid, Memoirs of the Lives and Writings of those Eminent Divines, who convened in the famous Assembly at Westminster in the Seventeenth Century, Vol. 1, p. 17:
Dr Harris was eminently distinguished by his prudent government of himself and his family, as well as of his college and of his flock. His government of himself was very remarkable. He who has no rule over his own spirit is like a city that is broken down, and without walls. But the prudent subject of this memoir had much rule over his own spirit, and was like the standing city, having strong walls. He was most exactly temperate in the use of all things, confining himself strictly to hours for food, sleep, labour, and recreation. He ate sparingly and seasonably, which had a strong tendency to preserve in him much vigour, even to a great age. His principal time for recreation was the afternoon of Saturday, when he would unbend his mind, and allow himself some harmless recreation, in order that he might be more vigorous for the important and deeply interesting work of the Lord's day.