Rashi says that תַׁשְבֵׂץ means beautiful holes which are made to place precious stones and pearls inside them. The Cohen should always look at himself as a potential recipient and a: כְ לִ י vessel for greatness. A person needs to always strive and seek to become a real Tzaddik and acquire all kinds of wonderful accomplishments in Avodas Hashem. The Kotzker Rebbe Zatzal said: When you’re “complete” then you’re “cooked up”; an expression of being really a nobody when you consider yourself finished in Avodas Hashem.
Striving and trying and seeking for perfection is an ongoing state for all those noble souls יִשְמַׁח לֵׂב מְבַקְ שֵׂי 'ה תהלים קה ג Rejoice all you SEEKERS of Hashem! As long as you are a M’vakesh (seeker), this is quite an accomplishment, since it’s the opposite of Yi'ush. R' Yisroel Salanter Zatzal said: ה לָּ חֲ ין מַׁ אֵׂ כְ מַׁ חֲ לַׁ ת הַׁ יִ אוּש the worst sickness is giving up and despairing of all those wonderful forms of Shleimus that are available to all humans; each in his own way.
If you spend your entire life just wishing and desiring Shleimus, you’ve accomplished worlds. You are the opposite of Eisav HaRasha, upon whom it says: וַיִׂבֶׁז עֵׂשָו אֶׁת הַבְכֹׁרָה כה לד. Eisav gave up, and started being M'vazeh the Bechora. The harder it is for you to become a true Tzaddik, and yet you continue to aspire despite so much frustration, the more you are a true opposite of Eisav.
Notice how Klal Yisroel was created mostly by the Tefilos of Leah Imeinu, who kept asking not to fall into: גוֹרָּלוֹ שֶ ל עֵׂ שָּ יו the “lot” of Eisav. Klal Yisroel’s very essence was created by the desires of not leading an evil life (and by: וַיַרְ א ה' כִׂי שְ נוּאָה לֵׂאָה ויצא כט לא the fact that she was rejected), having all the pain of feeling left-out from the eternal goodness of the truth.
And who wears the: כְ תֹנֶת תַׁשְבֵׂץ K'sones with its beautiful settings for potential precious stones? Cohanim! They were the peak Shevet who were Zoche by not worshipping the Eigel like everyone else did. The peak of the greatness of a human is remaining with a constant desire for Shleimus and not giving up! And being happy and content, despite his incomplete state, like it says: יִׂשְ מַח לֵׂב מְבַקְ שֵׂי ה' תהלים קה ג Rejoice all you SEEKERS of Hashem!
