A Conversation with Motovilov
"But how," I asked Father Seraphim, "can I know that I am in the grace of the Holy Spirit?" "It is very simple, your Godliness," he replied. "That is why the Lord says: All things are simple to those who find knowledge (Prov. 8:9, Septuagint). The trouble is that we do not seek this divine knowledge which does not puff up, for it is not of this world. This knowledge which is full of love for God and for our neighbour builds up every man for his salvation. Of this knowledge the Lord said that God wills all men to be saved, and to come to the knowledge of the truth (I Tim. 2:4). And of the lack of this knowledge He said to His Apostles: Are you also yet without understanding (Mat. 15:16)? Concerning this understanding [15], it is said in the Gospel of the Apostles: Then opened He their understanding (Lk. 24:45), and the Apostles always perceived whether the Spirit of God was dwelling in them or not; and being filled with understanding, they saw the presence of the Holy Spirit with them and declared positively that their work was holy and entirely pleasing to the Lord God. That explains why in their Epistles they wrote: It seemed good to the Holy Spirit and to us (Acts 15:28). Only on these grounds did they offer their Epistles as immutable truth for the benefit of all the faithful. Thus the holy Apostles were consciously aware of the presence in themselves of the Spirit of God. And so you see, your Godliness, how simple it is!"
