In the Gospel of St. John, V., 2-4, you will find that God used the waters of the pool of Probatica or Bethsaida at Jerusalem to heal the diseased. And as He gave temporal blessings to some through these waters, so He can certainly give spiritual blessings through holy water. In any case, if you are a Christian, you must admit that the waters of Baptism certainly convey spiritual graces to the soul.
Radio Replies Volume 1 by Rev. Dr. Leslie Rumble MSC and Rev. Charles Mortimer Carty