Venti has a somewhat recalcitrant attitude and a liking to rhyming in his speech. He is also quite bold, not fearing to insult or ignore those who are supposedly powerful. Most of whom are unaware of his true identity as the Wind Archon. Despite his playful personality as Venti, he consciously behaves differently, treating himself (as Venti) and his true identity, the Anemo Archon  , as two different entities. He speaks wisely and somewhat philosophically whenever he assumes his Anemo Archon persona. 

(Note: I really want the third line to contrast his usual energetic nature)

For Reference:

--> Venti's Voice