The opening of the soul is not a passive attitude; it is something active, where you have to put your will and your efforts. You like comparisons so much, as many people do, because they facilitate an easy way to explain things that otherwise would be very difficult to render in words.
Well then, imagine the soul like a ball of glass, completely transparent, “open” to the passing of light. Its transparent surface allows the “Light” of Divine Love to enter. Even more, it allows a total communication with this wonderful world of Divinity. It also allows the light glowing inside, this flame stimulated by Divine Love, to shine forth, visible for everybody, manifesting its presence.