For if [a Christian] cannot thank and praise God as well in calamities and sufferings as in prosperity and happiness, he is as far from the piety of a Christian as he that only loves them that love him is from the charity of a Christian. For to thank God only for such things as you like is no more a proper act of piety than to believe only what you see is an act of faith. Resignation and thanksgiving to God are only acts of piety when they are acts of faith, trust and confidence in the divine goodness.