I am looking for the source for the following quote
The day you were born was the day Gd decided the universe could no longer exist without you
The greeting card I saw it on said the quote was from the Talmud.
Apparently, it's attributed to Rabbi Nahman of Breslov:
The Hebrew, from there, is: היום בו נולדת הוא היום בו החליט הקב''ה שהעולם אינו יכול להתקיים בלעדיך.
But unfortunately even with the original Hebrew I can't find an actual source for it in his writings.
I think the source is, expressed slightly differently towards the end of Mishnah Sanhedrin 4:5 where it says,
לפיכך לכל אחד ואחד לומר, בשבילי נברא העולם
“Therefore everyone must say, ‘For my sake, the world was created.’ ”
The source is from The Lubavitcher Rebbe spoken on several occasions in 1988. The Rebbe instituted the idea of celebrating birthdays with hachlotas tovos giving extra tzedoka, making a birthday celebration and several other directives to inspire oneself spiritualy on their birthday and to carry that inspiration all year.