St John of Kronstadt

When God is present in all a man's thoughts, desires, intentions, words, and works, then it means that the kingdom of God has come to him; then he sees God in everything—in the world of thought, in the world of action, and in the material world; then the omnipresence of God is most clearly revealed to him, and a genuine fear of God dwells in his heart: he seeks every moment to please God, and fears every moment lest he may sin against God, present at his right hand. "Thy kingdom come!"

St John of Kronstadt.