Premanand Maharaj Ji
Why should I train my mind in mental naam jap instead of letting it roam?
The mind takes the colour you give it
The mind becomes whatever you pour into it, so do not give it freedom at the start. If you put the Name in the mind, it becomes full of the Name.
And if you put the Name into the mind, the mind becomes full of the Name. Put in Shyam and it becomes Shyam; put in Ram and it becomes Ram.