The Lord chose the apostles, that they should be with Him, and that he might send them forth to preach, and to have power to heal sicknesses, and to cast out devils.
Every Christian is chosen—chosen for similar deeds, namely: to be with the Lord, through unceasing remembrance of Him and awareness of His omnipresence, through the preaching and fulfillment of His commandments, and through a readiness to confess one’s faith in Him. In those circles where such a confession is made, it is a loud sermon for all to hear.
Every Christian has the power to heal infirmities—not of others, but his own, and not of the body, but of the soul—that is, sins and sinful habits—and to cast out devils, rejecting evil thoughts sown by them, and extinguishing the excitement of passions enflamed by them.
Do this and you will be an apostle, a fulfiller of what the Lord chose you for, an accomplisher of your calling as messenger. When at first you succeed in all this, then perhaps the Lord will appoint you as a special ambassador—to save others after you have saved yourself; and to help those who are tempted, after you yourself pass through all temptations, and through all experiences in good and evil.
But your job is to work upon yourself: for this you are chosen; the rest is in the hands of God. He who humbles himself shall be exalted.
+ St. Theophan the Recluse, Thoughts for Each Day of the Year: According to the Daily Church Readings from the Word of God