Here are quotes or excerpts from letters from two elders from Valaam Monastery, Elder Sergei and Abbot John. They are rich with practical advice on how to live an Orthodox life.
To Have Christ in Us is a Great Mystery Archimandrite Sergei (Chevitch) source
The fear of God is the fear of being separated from God. We shouldn’t strive to penetrate Divine mysteries with our minds. We must accept the mystery.