Matthew Henry Commentary Mark 6:7-13

"And he calleth unto him the twelve, and began to send them forth by two and two; and he gave them authority over the unclean spirits; and he charged them that they should take nothing for [their] journey, save a staff only; no bread, no wallet, now money in their purse; but [to go] shod with sandals: and, [said he], put not on two coats. And he said unto them, Wheresoever ye enter into a house, there abide till ye depart thence. And whatsoever place shall not receive you, and they hear you not, as ye go forth thence, shake off the dust that is under your feet for a testimony unto them. And they went out, and preached that [men] should repent. And they cast out many demons, and anointed with oil many that were sick, and healed them." — Mark 6:7-13 (ASV)

Though the apostles were conscious of their own great weakness, and expected no worldly advantage, yet, in obedience to their Master, and in dependence upon his strength, they went out. They did not amuse people with curious matters, but told them they must repent of their sins and turn to God. The servants of Christ may hope to turn many from darkness to God, and to heal souls by the power of the Holy Ghost.