Venerable Simeon, the Myrrhgusher and Prince of Serbia and Archbishop Seraphim (Sobolev)

What does it mean to walk in truth (III John 1:4)? It means accepting truth in your heart, abiding in such thoughts and feelings as the truth requires. Thus, it is the truth that God is everywhere and sees everything.

He who accepts this truth with his heart and begins to keep himself both inwardly and outwardly as if God Himself were before him and were seeing everything within him, is walking in this truth. It is the truth that God contains all, and that without Him we cannot do anything successfully.

He who accepts this with his heart, and turns in prayer in whatever he does for help to God, accepting whatever happens to him as being from the hand of the Lord—is walking in this truth.

It is true that death could steal us away at any hour, and after death immediately comes the judgement. He who accepts this truth with his heart, and begins to live as if he were about to die this minute and appear before the judgement of God, is walking in this truth. So it is concerning every other truth.

St. Theophan the Recluse, ”Thoughts for Each Day of the Year”