Key to practice

My Muster says: "The key to practice is the mind. When the mind is pure, there shall be no hindrance on the path of practice. Likewise, the key to the crossing of all beings is also the "mind"." It means that:

1. Really  understand that When attempting to cross others, put our mind into it but do not be forceful, selective, or discriminating. 

2. Truly Relinquish that Whatever forms or shapes beings take, be they rich or poor, smart or dumb, help and guide them just the same. Moreover, do not attach to the sense that "I am crossing these sentient beings."

For Really  understanding  we must learn the all sutras of the Buddha.

For Relinquishing  we must do six crossing methods : "giving, taking precepts, bearing sufferings, continuing, being steady, really enlightening."