Meditation Advice from the Sakyas quoted by Pabongka Rinpoche

If the visualization’s clear
Than let it be clear
But stop the mind from flying out.

If the visualization’s muddy,
Then let it be muddy,
But stop the mind from flying out.

Draw the toxins out
From your practice of meditation
And spit it away from you.

-The Heart Essence of the Angels by Pabongka Rinpoche (1878- 1941)