Greetings in that Divine and Most Precious name of our Lord and Savior Jesus Christ!
I had a meditation today at Liturgy for the Virgin Mary monthly holiday. I was talking before about how God is like gravity, it is universal, fundamental and yet subtle. God gives us the free-will, but like gravity, or like the programmer of a video game, we have absolute free will to make any decision we'd like, but yet are absolutely limited by the parameters of gravity or the programming. God gives us the free-will to make decisions, and He just might not necessarily know what decisions we will make, but since He is the parameters themselves, He knows every single possible outcome, because He designed them all. Thus God and free-will are perfectly harmonious, God gives us the freedom to make our own decisions, but entirely limits the possibilities of these decisions by the parameters of reality and then knows every possible outcome. Just as you can freely move your hand anywhere you'd like in time and space, but then again gravity and the other 25 fundamental cosmological forces will actually determine every possible choice of movement.
Also like gravity and these forces, God operates so smoothly in our lives that we rarely even notice until we learn what to look for. You do not necessarily feel or consciously think about gravity, and yet it is always there operating in our midst. Only when you exercise, or practice a sport with running or jumping or lifting heavy things, do you feel the presence of gravity very consciously and learn from experience how to operate with an through it. Orthodox worship are the spiritual sports and exercises which make you take notice of the perception of God directly, just as learning to play a sport teaches you to work with gravity. The Liturgy is the most powerful force in the Universe, and yet a common person might see the Blood and Body and might think nothing of it but a glass of wine and some bread. But we who practice the spiritual exercise of prayer, and move the spiritual weightlifting of worship, feel the very presence of the Eternal Godhead when we stand in the presence of Jesus Christ Flesh and Blood on the altar. Today standing before the Real Presence, my heart felt the highest perfections of God like Saint Theresa, and yet there was nothing necessarily out of the ordinary occurring. Only from the revelation of God did I feel this, and only because through His Grace, I have found the spiritual exercise which enhances the perception.
When we evangelize to outsiders who are not of the Orthodox persuasion, we must always remember that its not necessarily obvious to them, they do not feel the strength or the pull of the Divine Mysteries yet, just as a person inexperienced will not necessarily start running 4:30 minute miles, or hit 400 yard home-runs, or lift 200 lbs on the weight bar. Only after spiritual practice of prayer, and strength training of worship in the Liturgy, does God begin to reveal the spiritual strength and adeptness to begin to understand and experience the fullness of His presence.