Belief and Reason, in The Christian Vocation
We are to be pious, then, as pious as children, but not ignorant. Insofar as possible, each of us should study the faith seriously, rigorously — all of which means theology. Ours should be the piety of children and the sure doctrine of theologians.
Our desire to advance in theological knowledge, in sound, firm christian doctrine is sparked, above all, by the will to know and love God. It likewise stems from the concern of a faithful soul to attain the deepest meaning of the world, seen as coming from the hands of God. Every now and then, monotonously sounding like a broken record, some people try to resurrect a supposed incompatibility between faith and science, between human knowledge and divine revelation. But such incompatibility could only arise — and then only apparently — from a misunderstanding of the elements of the problem.
If the world has come from God, if he has created man in his image and likeness (cf. Gen 1:26) and given him a spark of divine light, the task of our intellect should be to uncover the divine meaning imbedded in all things by their nature, even if this can be attained only by dint of hard work. And with the light of faith, we also can perceive their supernatural purpose, resulting from the elevation of the natural order to the higher order of grace. We can never be afraid of developing human knowledge, because all intellectual effort, if it is serious, is aimed at truth. And Christ has said, "I am the truth." (Jn 14:6)
The Christian must have a hunger to know. Everything, from the most abstract knowledge to manual techniques, can and should lead to God. For there is no human undertaking which cannot be sanctified, which cannot be an opportunity to sanctify ourselves and to cooperate with God in the sanctification of the people with whom we work. The light of the followers of Jesus Christ should not be hidden in the depths of some valley, but should be placed on the mountain peak, so that "they may see your good works and give glory to your Father in heaven." (Mt 5:16)
To work in this way is to pray. To study thus is likewise prayer. Research done with this spirit is prayer too. We are always doing the same thing, for everything can be prayer, all activity can and should lead us to God, nourish our intimate dealings with him, from morning to night. Any honourable work can be prayer and all prayerful work is apostolate. In this way the soul develops a unity of life, which is both simple and strong.
J. Escrivá, The Christian Vocation, n. 10, in Christ is passing by (Dublin: Veritas, 1971)