Beyond the images, the essential thing is the interior experience. St Teresa felt God tearing out her insides and burning her heart with the fire of Love. He tore out her heart of stone and gave her a new heart (Cf. Ezek 36:26).
God introduced her to the New Covenant. The effect is to live according to the new covenant. Not from the external law but from the will of God engraved in the heart. We should all ask for this divine gift.
Bishop Silvio José Báez, o.c.d.
Auxiliary Bishop of Managua