From Abandonment to Divine Providence:
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 science of theology is full of theories and explanations of the wonders of this state in each soul according to its capacity. One may be conversant with all these speculations, speak and write about them admirably, instruct others and guide souls; yet, if these theories are only in the mind, one is, compared with those who, without any knowledge of these theories, receive the meaning of the designs of God and do His holy will, like a sick physician compared to simple people in perfect health. The designs of God and his divine will accepted by a faithful soul with simplicity produces this divine state in it without its knowledge, just as a medicine taken obediently will produce health, although the sick person neither knows nor wishes to know anything about medicine. As fire gives out heat, and not philosophical discussions about it, nor knowledge of its effects, so the designs of God and His holy will work in the soul for its sanctification, and not speculations of curiosity as to this principle and this state. When one is thirsty one quenches one’s thirst by drinking, not by reading books which treat of this condition. The desire to know does but increase this thirst. Therefore when one thirsts after sanctity, the desire to know about it only drives it further away. Speculation must be laid aside, and everything arranged by God as regards actions and sufferings must be accepted with simplicity, for those things that happen at each moment by the divine command or permission are always the most holy, the best and the most divine for us.