הוּא הָיָה אוֹמֵר, אַל תְּהִי בָז לְכָל אָדָם, וְאַל תְּהִי מַפְלִיג לְכָל דָּבָר, שֶׁאֵין לְךָ אָדָם שֶׁאֵין לוֹ שָׁעָה וְאֵין לְךָ דָבָר שֶׁאֵין לוֹ מָקוֹם:
He used to say: do not despise any man, and do not discriminate against anything, for there is no man that has not his hour, and there is no thing that has not its place.
Pirkei Avot is a collection of pithy sayings from ancient Rabbis, and this is one of my favorites. Don’t ever discount another human being, they tell us. We all have a reason for being here.