Matthew 10:8

The exercise of the Lord's power is wholly entrusted to the Apostles, that they who were formed in the image of Adam, and the likeness of God, should now obtain the perfect image of Christ; and whatever evil Satan had introduced into the body of Adam, this they should now repair by communion with the Lord's power.

After this, to make them trustworthy, He saith, "Heal the sick, cleanse the lepers, cast out devils: freely ye have received, freely give." See how He provides for their conduct, and that no less than for their miracles, implying that the miracles without this are nothing. Thus He both quells their pride by saying, "Freely ye have received, freely give;" and takes order for their being clear of covetousness. Moreover, lest it should be thought their own work, and they be lifted up by the signs that were wrought, He saith, "freely ye have received." "Ye bestow no favor on them that receive you, for not for a price did ye receive these things, nor after toil: for the grace is mine. In like manner therefore give ye to them also, for there is no finding a price worthy of them."

And because spiritual gifts are more lightly esteemed when money is made the means of obtaining them, He adds a condemnation of avarice; Freely ye have received, freely give; I your Master and Lord have imparted these to you without price, do you therefore give them to others in like manner, that the free grace of the Gospel be not corrupted.

The sick are the slothful who have not strength to live well; the lepers are the unclean in sin and carnal delights; the dæmoniacs are they that are given up under the power of the Devil.

(Hom. in Ev. iv. 1.) Miracles also were granted to the holy preachers, that the power they should show might be a pledge of the truth of their words, and they who preached new things should also do new things; wherefore it follows, Heal the sick, raise the dead, cleanse the lepers, cast out dæmons. (Hom. in Ev. xxix. 4.) These signs were necessary in the beginning of the Church; the faith of the believers must be fed with miracles, that it might grow. (Hom. in Ev. xxix. 4.) The Holy Church daily doth spiritually, what it then did materially by the Apostles; yea, things far greater, inasmuch as she raises and cures souls and not bodies. (Hom. in Ev. iv. 4.) For He knew before that there would be some that would turn the gift of the Spirit which they had received into merchandize, and pervert the power of miracles into an instrument of their covetousness.