The end of פרשת שמיני closes with the words, והתקדישתם והייתם קדושים which means, “Sanctify yourselves and be holy.”
What separates Jews from the rest of the world, is our ability to attain holiness. We expect of the Gentiles that they be righteous, but it is expected of us that we be holy.
The Talmud in מסכת יומא says that even if we try a little to achieve this קדושה, we will be helped a great deal from above.
The תורה תמימה says that the double language mentioned here teaches that מצוה גוררת מצוה, that one Mitzva leads to another.
We are also taught that we achieve holiness by acting in a moral manner. The words, קדושים תהיו, “Be holy”, comes about when we guard ourselves in sexual matters.
Sometimes it is important to reiterate this goal of trying to attain holiness.