SPIRITUAL UPHOLDER: The Heart of Christianity upholds and supports the work of SPIRITUAL SUBSTANCE and SPIRITUAL COMPLEMENT and is the final volume in the three book series, "The Heart of Christianity," by Orison de Corde. In this third book, the emphasis is on infused contemplation and the deeper things of the spiritual life, while also filling out the fundamentals of the whole journey to union with God through Jesus Christ our Lord. As before, readers will find here once more classic Catholic spirituality that is mystical yet practical, pure and severe yet inwardly upholding and consoling because it rings true for the ages, for all times and places. It is "Catholic" or universal.