[brought down by the Noam Elimelech (parashath Emor)]
How close can we bind ourselves to HaShem in tefillah? I don't know if there's a limit, but I do know that in the past we mentioned the Noam Elimelech discussing souls of the Tzaddikim unifying with HaShem in the words of prayer and Torah learning. I think there is an attainable level of davening for us where we are aware of the words of our prayers leaving our lips. Through this awareness we can come close to kissing HaShem.