What need is there to say more?
The childish work for their own benefit,
The Buddhas work for the benefit of others.
Just look at the difference between them.

If I do not exchange my happiness, for the suffering of others, I shall not attain the state of Buddhahood.
And even in Samsara I shall have no real joy.

The source of all misery in the world lies in thinking of oneself;
The source of all happiness lies in thinking of others.

Auteur: Śāntideva