The Two Truths

"The Buddhas teach the Dharma correctly depending on the two truths –
The conventional truths of the world and ultimate truth.
Those who do not fully understand the distinctions of the two truths
Do not fully understand the profound suchness in the teachings of the Buddha.
And without depending on conventions the ultimate cannot be taught.
And without realizing the ultimate nirvana will not be attained."

Arya Nagarjuna