Aang was pretty consistently portrayed as being spiritual, or at least not having any trouble in that area. he was shown meditating on multiple occasions and was quick to grasp any spiritual shenanigans going on around him.
Surely this wasn't the case early on. Didn't he need to receive specific training from that monk dude, err guru who hung out by himself in the empty air temple? I thought he was pretty impatient at times, but yeah for sure towards the end of avatar he became extremely spiritual.