Thomas à Kempis, in The Imitation of Christ, as quoted in Gerry Sittser’s excellent book Water from a Deep Well: Christian Spirituality from the Early Martyrs to Modern Missionaries:
What good does it do, then, to debate the Trinity, if by a lack of humility you are displeasing to the Trinity? In truth, lofty words do not make a person holy and just, but a virtuous life makes one dear to God. I would much rather feel profound sorrow for my sins than be able to define the theological term for it. If you knew the whole Bible by heart and the sayings of all the philosophers, what good would it all be without God’s love and grace?