Perfection consists in doing the will of God, not in understanding His designs. The designs of God, the good pleasure of God, the will of God, the operation of God and the gift of His grace are all one and the same thing in the spiritual life. It is God working in the soul to make it like unto Himself. Perfection is neither more nor less than the faithful co-operation of the soul with this work of God, and is begun, grows, and is consummated in the soul unperceived and in secret.
The order established by God and His divine will are the life of the soul no matter in what way they work, or are obeyed. Whatever connection the divine will has with the mind, it nourishes the soul, and continually enlarges it by giving it what is best for it at every moment. It is neither one thing nor another which produces these happy effects, but what God has willed for each moment. What was best for the moment that has passed is so no longer because it is no longer the will of God which, becoming apparent through other circumstances, brings to light the duty of the present moment. It is this duty under whatever guise it presents itself which is precisely that which is the most sanctifying for the soul.
Our moments are made fruitful by our fulfillment of the will of God. This is presented to us in countless different ways by the present duty which forms, increases, and consummates in us the new man until we attain the plenitude destined for us by the divine wisdom. This mysterious attainment of the age of Jesus Christ in our souls is the end ordained by God and the fruit of His grace and of His divine goodness.
Jean Pierre de Caussade Abandonment to Divine Providence