I decided to start my Motzei Yom Kippur off on the right foot, so I was listening to a shiur by Rav Fishel Schachter last night. He told a story that will make any person who is in SA, or should be in SA, truly understand the meaning of "Just for today I'll stay clean, I can act out tomorrow." He told over a true story of a Rav who was very involved in kiruv with at-risk teenage boys. The Rav suffered a terrible loss when his son died right after his upsherin. The boys who he worked with came to pay a shiva call, and they told him that they decided, as a group, that even though they were not considered frum anymore, they would keep one Shabbos in this boy's zechus. The Rebbe stood up and hugged and kissed each one and danced with them, even though he was sitting shiva. Afterwards someone said to him, "Why were you so excited? What's the big deal? So they will keep this Shabbos, and then the next Shabbos they will go back to their old ways". He replied, "If someone were to offer me one last Shabbos with my little precious Shloimela, I would give all the money in the world to have that one last day to say goodbye to him."
THIS IS HOW HASHEM VIEWS US. We come back to Hashem one day at a time. Maybe we will fall tomorrow, maybe we won't, but Hashem takes every day that we are clean and embraces it. Don't say, "one day isn't good enough", say "ah, at least I have one day clean and pure.