All suffering without exception comes from wishing for one’s own happiness. The perfect Buddhas arise from the altruistic mind. Therefore, completely exchanging one’s own happiness for the suffering of others is the Bodhisattvas’ practice.
Exchanging Self with Others
A bodhisattva’s practice is to purely exchange
our personal happiness for the suffering of others,
Because (all) our sufferings, without an exception,
Come from desiring our personal happiness,
While a fully enlightened Buddha is born from the attitude
of wishing others well.
– The Berzin Archives Thirty-seven Bodhisattva Practices
(Bodhisattva — In Tibetan Buddhism, a Bodhisattva is anyone who is motivated by compassion and seeks enlightenment not only for him/herself but also for everyone…)
I don’t think happiness is merely the lack of sadness, or the lack of suffering… do you?
Maybe the “desire” for happiness could be an attachment that one could taper off, while focusing on such other mental and emotional states like joy, gratitude, and awe. Desiring one thing too much, even enlightenment, is probably not the Bodhisattva way.