God & Reason
The Existence of God, Reason and Faith
Human reason, unaided by revelation, can arrive at certainty of God's existence by reflecting on the world's contingency, order, and finality.
Catholic teaching
Faith and reason are not opposed but complementary paths to truth; the Church teaches that God's existence can be known with certainty from creation by the natural light of human reason, even before divine revelation confirms and elevates this knowledge. Aquinas's five ways argue from motion, causality, contingency, degrees of perfection, and finality to a necessary first cause all call God.
Biblical foundation
Paul teaches the Romans that God's 'invisible nature, namely, his eternal power and deity,' has been clearly perceived in the created world, so that unbelievers are 'without excuse.' The Psalmist declares that 'the heavens declare the glory of God' and Wisdom rebukes those who fail to know the Creator through his works.
Scripture references
Historical evidence
The First Vatican Council in 1870 formally taught, against fideism and rationalism, that God 'can be known with certainty from the created world by the natural light of human reason,' a position rooted in the classical natural theology developed by Fathers such as Augustine and systematized by Aquinas.
The Church Fathers
“I asked the earth, and it answered me, 'I am not He'; and whatsoever are in it confessed the same... I asked the heavens... and they answered, 'We are not thy God, seek above us.'”