As in the words of King Solomon (Mishlei 6:23): "...and The Torah is a light" - literally light and not just wisdom nor analogous to light, literally light, as this it's reality above. So, when The Torah enters the soul, the light enters, as the ray of the sun enters a house. Furthermore, accurately analogous to The Torah is fire and as with a coal, the fire is contained within it and just needs a burst of oxygen to ignite the flame to expose it's many colors which were hidden prior.
...The Torah is similar is this manner in that all its words and letters are like coals that seem to be extinguished. However, when one exerts effort to study it only then does each letter burst into a flame exposing the many colors, which are the ideas latent within the letter.