by Roberto Santacroce Martins Inaugural post – March 2026

There is an invisible thread running through the history of Western philosophy – the thread that goes from the God who speaks from within to the God who is everything, and who, being everything, may no longer be “God” as we knew him.

The God who dwells inside thought

Let us begin from the interior. Saint Augustine, Bishop of Hippo in the fifth century, told us we need not look to the sky to find God. Truth, he insisted, does not dwell outside us – it lives in the most intimate fold of thought. The famous maxim noli foras ire, in te ipsum redi – “do not wish to go outside; it is in the interior of man that truth dwells” – is not merely spirituality. It is, above all, a logical assertion.

The argument is elegant in its simplicity: when you think, you realise there are truths that do not depend on you. Two plus two will always be four – today, tomorrow, regardless of beliefs, cultures or eras. Where do these immutable truths come from in a world where everything changes? Augustine answers: they can only come from an eternal source. And that source, for him, is God.

“God illuminates reason as the Sun illuminates the eyes – without him, we would see, but we would perceive nothing.” – Saint Augustine, adapted from the Confessions

This is what became known as the doctrine of divine illumination: human reason does not operate alone. There is a light that precedes it, that makes it possible. Augustine does not separate faith and reason – he stitches them together. “Believe in order to understand; understand in order to believe.” Each feeds the other in a circle he considered virtuous, not vicious.

The crack in the stone

The problem with opening reason as a path to God is that reason, once unleashed, does not ask permission about where it goes. Augustine invited logic into theology. Centuries later, Baruch Spinoza accepted the invitation – and arrived at a conclusion that scandalised Jews and Christians alike.

Spinoza was born in 1632, in Amsterdam. He was excommunicated by the Jewish community at the age of 23, and his main work, the Ethics, was published posthumously for fear of persecution. The reason for the scandal fit into a single Latin formula: Deus sive Natura – God, or in other words, Nature.

For Spinoza, there is no creator God who observes the world from the outside, who answers prayers, who punishes or rewards. God is not a person. God is the only substance that exists – infinite, eternal, cause of itself – and everything that exists is an expression, a mode, a fold of that substance. The universe was not created by God. The universe is God manifesting himself.

“God is the immanent, and not the transitive, cause of all things.” – Spinoza, Ethics I, proposition 18

This changes everything. In Augustine’s Christian God, there is an asymmetry: the creator and the creature, the father and the son, the eternal and the temporal. In Spinoza’s God, that asymmetry collapses. There is no transcendence – there is only immanence. There are no miracles, because the laws of nature are the necessary expression of God, and God does not violate himself.

The thread that unites them – and what separates them

The connection between the two thinkers lies precisely in reason as access to the divine. Augustine said God illuminates thought from within. Spinoza took that idea to its limit: if God is the rational structure of the universe, then knowing the universe through reason is knowing God. Philosophy itself becomes a spiritual act.

But the separation is enormous. Augustine’s God loves. Has will. Created out of goodness. Can be found in a prayer whispered in the dark. Spinoza’s God does not know you exist – not in the personal sense. He is necessity, law, the order that sustains everything. Closer to Einstein’s cosmos than to the Our Father.

It is at this moment – in the seventeenth century, with Spinoza – that philosophy begins to separate definitively from the Christian God. Not through atheism, but through something more subtle: the idea that God can be thought without revelation, without scriptures, without the Church. That reason arrives there on its own. And that what it finds, when it arrives, is different from what the religions promised.

Why this still matters

We live in an age when the word “God” seems to demand that we choose a side – religious or atheist, believer or sceptic. Augustine and Spinoza remind us that this dichotomy is, itself, an impoverishment.

There is a long tradition of thinkers who took God seriously without needing the institutional framework. Who found in the divine not a stern father, but the deep logic of things. Who saw in reason not a threat to faith, but the most honest path towards whatever exists beyond the surface of the world.

This blog is born from exactly that space. Pensaduras – a word I carry like a handful of questions that hurt to be carried. Philosophy not as answer, but as the courage to keep asking.

Welcome.

Silence all around, in the pensaduras of being – God unfolds.

– Roberto Santacroce Martins