Related for Menachot 86:10

"And you shall see it [the tzitzit] and remember". That it was only made for recollection, and when you see it the mitzvah recalls and reminds you of the rest of the mitzvot. Because tzitzit are like a seal on the clothes that are made for a servant, a sign that he is serving his master. And when they see Israel remembers that they are servants to God and that it is incumbent upon them to perform all God's commandments. And the value of tzitzit is 600 in gematria, and there are eight threads and five knots [per fringe] -- behold, this is 613 like the 613 commandments. And when one sees it [the fringe], it reminds one of all the commandments, and gives God a symbol to signify that they are God's servants, and a sign on their clothing and a sign [on] their houses and they are called a "seal" on it, and tefillin on their heads and arms to signify that they are servants. For the four signs surround a person: brit milah in front of them, a mezuzah at their right, tefillin on their left, tzitzit on their clothing that are dragged on their clothing behind them as they walk.