It does not seem proper to speak of one attribute of God as being more central and fundamental than another; but if this were permissible, the Scriptural emphasis on the holiness of God would seem to justify its selection.
Louis BerkhofIt is that perfection of God by which he is devoid of all change, not only in His Being, but also in His perfections, and in His purposes and promises.
Louis Berkhof[Martin] Luther did not regard the water in baptism as common water, but as a water which had become, through the Word with its inherent divine power, a gracious water of life, a washing of regeneration. Through this divine efficacy of the Word the sacrament effects regeneration.
Louis Berkhof