The smile of the contemplative in the presence of the Beloved is merely a physical expression of the total joy one perceives as one communes with God. St. Bernard used to say, "The joy of being in love is in the very loving." In other words, joy is not to be sought for itself, but is a by-product of love, and the smile is but the physical, exterior expression of the inner joy-love.
Love the beautiful in everything; it is a ray of light divine. It is love's beauty. The beautiful thrills us into a kind of ecstasy, suspending the din of our inward activity in the silence of admiration; and admiration gives our nature a kind of fulfillment, a restful satiety asking for nothing more. It is the very essence of contemplative adoration.