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.
BodhidharmaDon't hate life and death or love life and death. Keep your every thought free of delusion, and in life you'll witness the beginning of nirvana, and in death you'll experience the assurance of no rebirth.
BodhidharmaPeople who don't see their own nature and imagine they can practice thoughtlessness all the time are liars and fools.
Bodhidharma