There was a famous shmuz (I think from Rav Nosson Vachtfogel) to his talmidim on motzai yom kippur. He gave a mashal to one who builds a mansion and then makes a big chanukas habayis to commemorate his achievement. During the celebration he fell off the roof of his house. When he landed he started crying that his house collapsed, but his friends told him that his house is still standing, just he fell off. So too our avodah on Yom Kippur lifts us up to a great height, and even if later we fall from that level- the avodah was not wasted and next year we will return to our tower and build it even higher.
