What happens due to meditations is mentioned here. Earlier we studied that there are thought modifications in mind which cause disturbances. In this sutra, it is mentioned that because of meditation, the vrittis(though modifications) become weak. The thoughts in the mind stabilize. Once the thoughts stabilize then the mind becomes clear like a transparent crystal without colorings and its ability to see things clearly.
The mind starts seeing things clearly ass they are and identifies itself with the object of meditation. Earlier we studied that vrittis are two types klishta and aklishta. These are the colorings of the mind which will not help us to see things clearly. Meditation helps in clearing the mind, calming the mind.