Actually, the expression “celebrating” birth is not used in sutras.
This is because in Buddhism, “life” is the beginning of “suffering,” so it is not about “celebrating.”
Instead, many expressions such as “rejoicing” are used in Buddhist scriptures instead of “celebrating” birth.
So why rejoice if suffering begins? You might think so.
It makes me happy to be able to meet good “causes” and good “relationships” given by those who were born.
It is said that when Buddha was born, all people and animals were happy to dance, plants and trees were happy to bloom untimely flowers, celestial people were happy to rain honeydew, and even the earth shuddered with joy.
Even now, on Buddha's birthday, it's called a “flower festival,” and they hold a grand “nativity reward party” to rejoice and thank them for the relationship they have received.
In Buddhism, in order to rejoice at meeting that person and appreciate the relationship with that person, “joy” is expressed grandly rather than “celebration” as commonly called.
So,
“Happy birthday”
It's not,
It's “thank you for being born” isn't it?
If someone has a birthday, please be sure to tell them how you feel.
Thank you for being born.
Thanks for meeting me.