Mahayana

How could I be unhappy about others being pleased? Acarya Shantideva

The Buddhas are delighted when sentient beings are happy and distressed when they are hurt. So by loving them I will please all Buddhas and by harming them I will injure the wise. For just as someone whose body is engulfed by fire finds no pleasure in desirable objects, it is impossible for the compassionate ones to be joyous when a sentient being is in pain…

The Record of Tung-Shan

Earnestly avoid seeking without, lest it recede far from you.
Today I am walking alone, yet everywhere I meet him.
He is now no other than myself, but I am not now him.
It must be understood in this way in order to merge with Suchness.
Tung-Shan

Maha Prajnaparamita Sutra – Tangut Manuscript

The Buddha: Without mark is this perfection of wisdom. Just as the element of space and the element of air cannot be approached by the mark of the total reality of any dharma, just so the perfection of wisdom.
The Questions of Suvikrantavikramin. Perfect Wisdom: The Short Prajnaparamita.