To one who has faith, no explanation is necessary. To one without faith, no explanation is possible.

The quote by Thomas Aquinas explores the profound nature of faith and how it shapes understanding. When he says, “To one who has faith, no explanation is necessary,” he means that a person with genuine faith accepts certain truths deeply and intuitively, without needing logical proof or detailed reasoning. Faith, in this sense, is a form of belief that transcends the need for constant justification.

On the other hand, Aquinas points out that “To one without faith, no explanation is possible.” This highlights the idea that for those who lack faith, no amount of reasoning or evidence will be sufficient to convince them of spiritual or metaphysical truths. Their skepticism or disbelief creates a barrier that explanations alone cannot cross, emphasizing the divide between faith and reason.

The origin of this quote lies in Aquinas’s work as a medieval theologian and philosopher who sought to reconcile faith with reason. His writings often addressed how faith complements human understanding but also stands apart from purely intellectual knowledge. This quote captures his view that faith is a unique form of knowing that cannot be fully explained or imposed through argument alone.

In essence, Aquinas reminds us that faith is a deeply personal and internal experience—something that those who possess it inherently understand, while those who do not remain unable to grasp it, regardless of explanation. It underscores the limits of reason and the special nature of faith in human life.