You should know that
The Buddha nature of the
Ignorant and of the
Enlightened are the same,
The only difference being
That the former are deluded whereas 
The latter are awakened to it.

The Platform Sutra (8th c. CE-13th c. CE), The Platform Sutra of the Sixth Patriarch (Chinese: 六祖壇經; pinyin: Liùzǔ Tánjīng or simply: 壇經 Tánjīng) is a Chan Buddhist scripture that was composed in China during the 8th to 13th century. Its key themes are the direct perception of one's true nature, and the unity in essence of śīla (conduct), dhyāna (meditation) and prajñā (wisdom).