Priesthood, while performed on earth, belongs to the works of the heavenly Powers. Its purpose is to deify man, to elevate him to heavenly bliss. This book analyzes in depth the priestly ministry, as handed down to us by Jesus Christ, and comments step by step on the ordinations and ordinations of the clergy. It is always based on the infallible and divinely enlightened word of the Holy Fathers. A necessary manual for every priest and for anyone interested in studying the great mystery of Priesthood.