“So much did the apostles realize that everything which pertains to salvation was bestowed on them by the Lord that they asked for faith itself to be given them by the Lord when they said: ‘Increase our faith,’ for they did not presume that its fullness would come from free will but believed that it would be conferred on them by a gift of God.
“The Author of human salvation teaches us how even our faith is unstable and weak and by no means sufficient unto itself, unless it has been strengthened by the Lord’s help, when He says to Peter: ‘Simon, Simon, behold Satan has sought to sift you like wheat, but I have asked My Father that your faith might not fail.'”
–St. John Cassian