Tao Te Ching

“Sesame oil is the essence. Although the ignorant know that it is in the sesame seed, they do not understand the way of cause, effect, and becoming and therefor are not able to extract the essence. In the same way, the guru shows the truth of tathata. If it is not shown by the guru, it cannot be realized just like the sesame oil that remains in the seed”

— Tilopa 988 – 1069 CE via Nalanda Translation Committee
from Rain of Wisdom