No, you don't have to be 'absolutely pure' to walk a spiritual path, imo.
To get to your destination or Goal* ...I mean, for the Door to really open it sure does help!! But I mean, pure, kind, compassionate,
forgiving thoughts and deeds...not the music you listen to. :)
(This isn't Non-duality so I don't want any guff from those guys about
I'm already at my destination,
the Goal is linear thinking and there is no 'you' anyway, just Brahman!! )