Don’t be tempted to indulge yourself in not coming to church at the beginning of the service or leaving before it is over. Remember, each service is a complete unit and it can provide its full benefit only in its entirety. Just as food is tasty only when it is fully seasoned, so the service can completely satisfy the spiritual taste only when it is heard in full. Thus, he who misses the beginning or does not remain until the end is laboring, but he deprives himself of the fruit of his labor; he creates with one hand and destroys with the others.
Further, one must go to church not inattentively. For, it is always possible that one may go to church not in a way worthy of praise but rather of condemnation, i.e., by going and not receiving any spiritual benefit. Approaching the church, you must leave every care and worry about your affairs at the threshold in order to enter with a serene mind. Entering the church, you must put on reverence like a garment, remembering to Whom we are coming and to Whom we intend to address our prayers.
Having taken your place in the church (best of all, the same place each time), you should gather your thoughts and mentally stand before the face of the omnipresent God, offering Him reverent worship in body and spirit, with a contrite heart and in humble reverence. After this, you must follow, without wandering thoughts, everything that is going on — what is being sung and read in the church — all the way to the end of the service.
That is all! In this way, we won’t be bored in church, looking here and there and starting conversations, and we won’t be wishing that the service be over soon. Instead, passing from one prayerful feeling to another and from one reverent thought to the next, we will be like those in a fragrant garden, moving from one group of flowers to another.
St. Theophanes The Recluse