The Tiferes Shlomo offers a beautiful interpretation of the gemara in Brachos, "afilu nachash karuch al akeivo, afilu melech shoel b'shlomo lo yafsik", that even if a snake wraps itself around one's foot, even if a king begins a conversation, one should not interrupt tefilah. There are two great challenges in avodas Hashem which the gemara is warning us of. The first great challenge occurs when one wakes up from the slumber of sin and suddenly realizes how far away one is from Hashem. There is a great temptation to surrender to despair and hopelessness. This feeling of despair is symbolized by the snake which wraps itself around a person's ankles trying to drag him/her down. The opportunity for tefilah is the antidote to the depression of the snake. Even if one has succumbed to sin, there always exists the opportunity of return.
At the opposite extreme is the person who feels so immersed in "spirituality" that he/she loses sight of the restrictions and restraints of halacha and considers attending to these details beneath his/her stature. This is the danger of hubris. Even if one is "speaking to the King", one is still not excused from tefillah. This ideal is demonstrated in our parsha by Avraham's willingness to leave communion with G-d to fulfill the mitzvah of hachnasat orchim -- an abstract spirituality cannot replace the concrete performance of mitzvos. "V'hu yoshev pesach ha'ohel" - Avraham managed to keep the proper perspective because rather than look at all he had achieved, he viewed himself as still sitting at threshold, looking at the door of opportunity for further growth in mitzvos that lay open ahead.