The ways that Thomism has historically thought about knowledge and habit in Thomas Aquinas's ethics have become increasingly destabilised. This article briefly documents this destabilisation before considering three images that have emerged in recent engagements with the ethics of Aquinas on moral knowledge and action. The three images are brought to bear on a discussion of what Aquinas may have meant by calling synderesis a ‘natural habit’. The first image is John Milbank's and Catherine Pickstock's image of God as country bumpkin and it follows Aquinas's own description of the way God knows particulars out of divine simplicity. They argue that human knowledge of particulars comes from participation in the mind of God. This is participation in eternal law from which natural law is derived and so natural law cannot constitute a separate, sufficient system of moral knowledge. With the second image, the bricoleur, Jeffrey Stout argues that system-building was far from the kind of work that Aquinas was about, despite appearances that have disguised how freely Aquinas himself made use of the moral resources at his disposal. The third image, the forester, is deployed by Charles Pinches intentionally to improve on some of the problems with Stout's image. The Christian moral agent develops habits of mind that both aid in right perception, and hence right knowledge, and depend on right perception for right action. A discussion of this apparent paradox reveals something of the complexity of theoretical knowledge and practical skills that are involved in moral reasoning for Aquinas.