Should one be very particular about purity and impurity when engaged in the sadhana of Japa and Dhyana?
Do not care for the vagaries of the mind. Carry on Smarana and Dhyana of the Nama and Rupa you like best, in the manner you are accustomed to. In this way, you will acquire Ekaagrata (concentration); you will realize your heart’s desire. Do not entertain in your mind the idea of purity and impurity while doing this sadhana of Dhyana. There is nothing impure in the world. When the Lord is immanent everywhere in everything, how can anything be impure? Even if something appears to the ulterior eye as impure, the moment it contacts the Name of the Lord, it becomes purified.(SS June 2002, pg 185)