Tractatus Logico-Philosophicus propositions 6.41, 6.42, and 6.421

The sense of the world must lie outside the world. In the world everything is as it is and happens as it does happen. In it there is no value--and if there were, it would be of no value. If there is a value which is of value, it must lie outside all happening and being-so. For all happening and being-so is accidental. What makes it non-accidental cannot lie in the world, for otherwise this would again be accidental. It must lie outside the world.

Hence also there can be no ethical propositions. Propositions cannot express anything higher.

It is clear that ethics cannot be expressed. Ethics is transcendental [Die Ethik ist transzendental]. (Ethics and aesthetics are one.)