And Father Seraphim, smiling pleasantly, said…:
The sweetest earthly fragrance cannot be compared with the fragrance which we now feel, for we are now enveloped in the fragrance of the Holy Spirit of God.
What on earth can be like it? Mark, your Godliness, you have told me that around us it is warm as in a bath-house; but look, neither on you nor on me does the snow melt, nor does it underfoot; therefore, this warmth is not in the air but in us.
It is that very warmth about which the Holy Spirit in the words of prayer makes us cry to the Lord: ‘Warm me with the warmth of Thy Holy Spirit!’
By it the hermits of both sexes were kept warm and did not fear the winter frost, being clad, as in fur coats, in the grace-given clothing woven by the Holy Spirit.
And so it must be in actual fact, for the grace of God must dwell within us, in our heart, because the Lord said: The Kingdom of God is within you (Lk. 17:21).
By the Kingdom of God the Lord meant the grace of the Holy Spirit. This Kingdom of God is now within us, and the grace of the Holy Spirit shines upon us and warms us from without as well.
It fills the surrounding air with many fragrant odours, sweetens our senses with heavenly delight and floods our hearts with unutterable joy.
Our present state is that of which the Apostle says; The Kingdom of God is not food and drink, but righteousness and peace and joy in the Holy Spirit (Rom. 14:17).
Our faith consists not in the plausible words of earthly wisdom, but in the demonstration of the Spirit and power (cp. I Cor.2:4). That is just the state that we are in now.
Of this state the Lord said: There are some of those standing here who shall not taste of death till they see the Kingdom of God come in power (Mk. 9:1).
See, my son, what unspeakable joy the Lord God has now granted us! This is what it means to be in the fullness of the Holy Spirit, about which St. Macarius of Egypt writes: ‘I myself was in the fullness of the Holy Spirit.’
With this fullness of His Holy Spirit the Lord has now filled us poor creatures to overflowing. So there is no need now, your Godliness, to ask how people come to be in the grace of the Holy Spirit. Will you remember this manifestation of God’s ineffable mercy which has visited us?
Seraphim of Sarov (Orthodox Church; 1759-1833): On the Acquisition of the Holy Spirit.