What you should do is to know your own mind and realize your own buddha-nature, which neither rests nor moves, neither becomes nor ceases to be, neither comes nor goes, neither affirms nor denies, neither stays nor departs.
The dharma is nondual, and so is the mind. The path is pure and above all forms. I warn you not to use those exercises for meditation on quietude or for keeping the mind a blank. The mind is by nature pure, so there is nothing for us to crave for or give up. Do your best, each of you, and go wherever circumstances lead.
Amen to that, Roshi