In that light, the parent’s phrase is a rehearsal for the ultimate non-negotiable. It is a small, daily practice in accepting limits. It is the voice of the finite within the finite, declaring: Here is the wall. Here is the rule. Here is the end of your inquiry, not because I am cruel, but because the map is not the territory, and sometimes you just need to put on your shoes.

“Because I said so” is neither good nor evil. It is a tool. In the hands of the wise, it is a speed bump on the road to chaos—a brief, firm halt that allows a child to feel the shape of a boundary. In the hands of the weak, it is a crutch for a collapsing argument. In the hands of the cruel, it is a gag.