Whatever ideas may fill the mind, whatever feelings afflict the body; even if the mind should be tormented with distractions and troubles, and the body with sickness and pain, nevertheless the divine will is ever for the present moment the life of the soul and of the body; in fact, neither the one nor the other, no matter in what condition it may be, can be sustained by any other power.
The divine influence alone can sanctify us. Without it bread may be poison, and poison a salutary remedy. Without it reading only darkens the mind; with it darkness is made light. It is everything that is good and true in all things, and in all things it unites us to God, who, being infinite in all perfections, leaves nothing to be desired by the soul that possesses Him.
from Abandonment to Divine Providence