A Selection of Aggadaic Sayings about Tzitzit
“The L-rd desires for the sake of Israel’s righteousness to make the Torah great and glorious” (Isaiah 42:21). G-d did not leave anything in His world which does not involve a mitzvah for Israel. Humans wear clothing, so G-d commanded to attach tzitzit to their garments.
— Midrash Rabbah Numbers 17:7.