You can't know your real mind as long as you deceive yourself.
Our true buddha-nature has no shape. And the dust of affliction has no form.
Trying to find a buddha or enlightenment is like trying to grab space.
Life and death are important. Don't suffer them in vain.
If you use your mind to study reality, you won't understand either your mind or reality. If you study reality without using your mind, you'll understand both.
To enter by reason means to realize the essence through instruction and to believe that all living things share the same true nature, which isn't apparent because it's shrouded by sensation and delusion.