Keep the calendar as much as you can, participating in the times and seasons even when you cannot participate in the services, but participate in the services whenever possible. Remember, the laity is a part of the priesthood as well, and the Divine Liturgy is a type of the liturgy in Heaven, the temple a part of the Heavenly Temple. Staying away from the services is a form of independence and a denial of the Church, and so a denial of the Incarnation. You must actually plan specific times to participate, or else it will always be lumped with what are happenstance, accident, and mere convenience. — Catechetical Letter 4/16/05