The article constructs the emergence of environmental ethics and eco-theology, referring to ecumenical discussions and influences. It then focuses on the difference between two types of eco-theology: one that may be called eco-centric, the other theo-centric. Following the second model and rooted in Karl Barth's approach to creation theology, the argument is put forward that a dogmatic approach today has to be based on the concept of ‘creatio ex nihilo’. Creation is not a commodity but utterly dependent on God's ongoing creative speech-act. A revision of the doctrine of election focuses on creation in a Trinitarian perspective. Creation is an eschatological and soteriological category that is grounded biblically in the post-exilic hope for a new creation. As a promise, it is a critique of all utopic and dystopic claims in human history. This has two consequences. First, the need to regain a realistic concept of the political that allows for conflicting aims and that challenges the concept of dominion. And second, to regain a realistic approach to ‘nature’ that defines the ethical concern as ‘habitability’. The fundamental challenge is to live in a disenchanted world while waiting for the world to come. This tension is enacted in the Eucharist.

While the Christian emphasis on creation as a free and gracious gift is often juxtaposed with Neoplatonic notions of world-production as the emanation of being from the First Cause, I argue in this essay that there is no obvious contradiction between the doctrines of creation ex nihilo and emanation ex deo in Aquinas's thought. This is partly because the Christian teaching that the world is created ‘from nothing’ was never intended to deny that it was from God, but to deny that it was made from anything other than God. By drawing on the Liber de Causis to support his explanation of creation as the emanation of all being from the universal cause, Aquinas provides us with a way to foreground a doctrine which belongs to the foundations of Christian faith but which rarely receives sufficient attention in systematic theology – namely, the omnipresence of the God who is in everything.

Theological explorations of law have sometimes followed a “prophetic” model in which scripture or theological ethics serves as the primary norm for human law. After all, if God has spoken his Law into the world, especially a world beset by sin and oppression, should not human law answer to that Law? Moreover, is not law more authoritative when it is “found” or “discovered” within the framework of divine revelation than when it is “made” autonomously by fallen human beings?

This paper takes its cue from studies that point to the influence of Thomas Aquinas on the psychoanalytical theory of Jacques Lacan and explores key Lacanian themes of language, desire, God/the real, embodiment and gender from the perspective of the Summa Theologiae. To illustrate how a Lacanian perspective opens new interpretative possibilities with regard to the Summa, it focuses on language and desire, on the doctrines of creation ex nihilo and the incarnation, and on Thomas's attempt to incorporate gendered Aristotelian concepts of form and matter into Christian theology. It argues that it is possible to resist Lacan's nihilism, while allowing his psychoanalytical approach to language to bring about a deconstructive reading of Aristotelian philosophy from the perspective of Christian theology. This allows the reconciling paradox of the incarnation to challenge the dualism of form and matter inherent in philosophical cosmologies, to offer a more dynamic understanding of the significance of material creation and its incorporation into God by way of the resurrected body of Christ. A Lacanian approach brings to light hidden and neglected dimensions of Thomas's theology, making possible a postmodern Thomism, which offers a viable theological response to some of the most challenging questions facing theology today, around questions of language, desire, gender and creation.