BECOMING A MONK

To express something is to degrade it, Vivekananda said.

Becoming a monk is expressing something, expressing one's spirituality, so does that mean one's spirituality is degraded when he becomes a monk?

Vivekananda, who was famous for how well he expressed himself, in his capacity as a monk, would say yes.  But that does not mean one should not do it.

Expression is a pointer.  Becoming a monk points to something.