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"Nirvana is not expensive, warmth contains light" comes from the motto of Cui Yuan in the Eastern Han Dynasty.
Cui Yuan, a native of Anping County in the Eastern Han Dynasty, was a famous calligrapher in the Han Dynasty. He was especially good at cursive writing and studied under him. He was called "Cui Du".
Later, Zhang Zhi adopted Fa tui and Du Fu, and his books made great progress, becoming a master of cursive script in Han Dynasty, known as "the sage of grass".
Full text of motto:
No one is short and no one is long.
Be careful when giving and don't forget when receiving.
The reputation of the world is insufficient, and benevolence is the discipline.
What's the harm in denigrating mediocrity?
Don't make the name too true, and keep the holy land of fools.
Nirvana is precious, and warmth contains light.
The weak are born to be human, and the old commandments are strong.
Because it is too long to introduce, it is difficult to measure.
Be careful what you eat and drink, and the contented will always be happy.
Perseverance will last a long time.