What is the importance of satsang

A saint used to teach Gita to his disciples every day.  All the disciples were happy with this but one disciple looked worried.  The saint asked him the reason for this.  The disciple said- Gurudev, I do not understand what you teach, I am worried and sad because of that.  Guru said- bring water in the basket carrying coal.  The disciple was surprised, how will the water fill the basket?  But since the Guru had given this order, he filled the river water in the basket and ran but to no avail.  Water trickled down from the basket and fell.  He filled water in the basket and ran to Guru Ji many times, but the water did not stick in the basket.  Then he went to his Gurudev and said - Gurudev, it is not possible to bring water in the basket, no use.  Guru said - there is benefit.  Look in the basket.  The pupil noticed - by immersing the coal basket in the water again and again, it has become clean.  His blackness has been washed away.  Guru said- Just as the coal basket became clean and you did not even know.  In the same way, grace starts by listening to satsang again and again.  Even if you do not understand right now, but you will definitely feel the benefit of satsang in your life and the mercy of Guru will always be on you.