[While he may not be told that exactly, there's still a 'but...' involved, evidenced by Qui-Gon's movements as he raises a hand in the universal 'slow your roll' gesture.]

A lightsaber is a great responsibility, Lune. While I am not against the idea of you constructing your own, there is a lot to consider before taking those first steps.

[He unclasps his own lightsaber's hilt and bends to Lune's level so the boy can have a better look at it.]

This weapon is everything to me and has been for decades. It becomes a part of you. It is a signal to all those around you that you are willing to help... and ready to fight. Potentially to the death.