A Life of Kedushah
Hashem told Moshe (Shemos 19:10) וקדשתם ומחר היום, "Sanctify them [the Yidden], today and tomorrow." This is man's obligation in this world, to live a holy life filled with Torah and mitzvos.
We will explain this idea with a mashal: A man once left a chasunah hall, and late at night, he remembered that he had forgotten something in the hall. He returned to the hall to search for the lost item. The hall was messy, with leftover food scraps and dirt on the floor. It was dark, and the furniture was strewn around. It was hard to believe that this room had a beautiful event just a few hours earlier. He thought, "If it ends up being so messy, what is the purpose of making such a luxurious celebration?" But then he told himself, "A wedding took place in this hall, where a chasan declared לי מקודשת את הרי. This makes the mess and state of disarray all worthwhile."
The nimshal is that at the end of a person's life, he will be placed in the grave, and within a short time, nothing will remain of him other than dirt and bones. But if there was kedushin in his lifetime (he lived a life of kedushah with Torah and mitzvos), then his life was worthwhile. However, if there wasn't any kedushah in his life, one can ask, what is the purpose of it all?
The Kedushas Levi (Likutim) discusses the letters צ"סעפ (these are the letters in order of the alef beis). The letter 'ס is closed from all sides, and the letters 'פ 'ע can be translated as ה"פ ן"עי, eye and mouth. One should keep his eyes and mouth closed from things he shouldn't see or say, and then he will be 'צ, a ק"צדי.
Another hint to this concept is from the pasuk (Shemos 19:23) וקדשתו ההר את הגבל, "Make boundaries around the mountain and sanctify it." ההר את הגבל can be explained as follows: Take the letters that border with the letters ר"ה. The letters before and after 'ה are 'ד and 'ו. The letters before and after 'ר are 'ק and 'ש. So, we have the letters that spell ש"קדו. This hints that by הגבל, making boundaries and precautions, one becomes holy.
