' The Diamond Sutra '...

"Subhuti, what do you think? Let no one say the Tathagata cherishes the idea: I must liberate all living beings. Allow no such thought, Subhuti. Wherefore? Because in reality there are no living beings to be liberated by the Tathagata. If there were living beings for the Tathagata to liberate, He would partake in the idea of selfhood, personality entity, and separate individuality."

Also from the Diamond Sutra:

"Yet when vast, uncountable, immeasurable numbers of beings have thus been liberated, verily no being has been liberated. Why is this, Subhuti? It is because no Bodhisattva who is a real Bodhisattva cherishes the idea of an ego-entity, a personality, a being, or a separated individuality."

"A Bodhisattva should develop a mind which alights upon nothing whatsoever..."

"The mind should be kept independent of any thoughts which arise within it." (the principle of khorde rushen)