“By the sacred anointing of the sick and the prayer of the priests the whole Church commends those who are ill to the suffering and glorified Lord, that he may raise them up and save them. And indeed she exhorts them to contribute to the good of the People of God by freely uniting themselves to the Passion and death of Christ.”
Through the sacrament of anointing, Christ strengthens the faithful who are afflicted by illness, providing them with the strongest means of support. Jesus showed great concern for the bodily and spiritual welfare of the sick and commanded his followers to do the same. The celebration of this sacrament is an opportunity for the deepening of the faith of the community who are able to witness the faith and devotion of those being anointed.
Is anyone among you suffering? He should pray. Is anyone in good spirits? He should sing praise. Is anyone among you sick? He should summon the presbyters of the church, and they should pray over him and anoint [him] with oil in the name of the Lord, and the prayer of faith will save the sick person, and the Lord will raise him up. If he has committed any sins, he will be forgiven. -James 5:13-15