On the Transfiguration a voice from heaven uttered only hear Him (Matt. 17:5). Why is this so? Because the fruit of obedience was being shown to them. It was as if the Heavenly Father were saying: Do you want to attain this? Hear what He will suggest and command you. If you go on His path, you will undoubtedly enter into the realm of light, which will embrace you not from without, but will come forth from within, and always keep you in a state in which all of your bones will utter: it is good for us to be this way. You will be filled with the light of joy, the light of good will, the light of knowledge; all sorrows will pass by, the dissonance of the passions will disappear, falsehood and delusion will disperse. On the earth you will become heavenly; from among the earthly-born, you will become Godly-born; from amidst the perishable you will become eternally blessed. Then all will be yours, because you yourselves will become Christ’s. He who loves Christ the Lord is beloved of the heavenly Father, and They come to him and make their abode with him. This is the light of the Transfiguration.
„Thoughts for Each Day of the Year“ by St. Theophan the Recluse