Tzava'at HaRivash Chapter 126
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גם זה הוא כלל גדול כשיבא לאדם מצוה במחשבה אל ימנע לעשותה משום יוהרא או משום איזה פני' בה. כידוע מתוך שלא לשמה כו'. כי גם במעשה טובה נפעל למעלה כלי טוב ומחשבה נעשה פנימית הכלי:
This is a very important principle: If it enters your mind to do a specific *mitzvah,*do not refrain from doing it because of not wanting to be seen as aggrandizing yourself or other self-interests, for certainly, from the “inner aspect-toch-תוך” of not doing it for the sake of HaShem, you will come to do it for the sake of HaShem,²⁰⁹ As our sages said, “A person should always engage in Torah and the fulfillment of the commandments-Mitzvot, even if he does not do so for the sake of HaShem. For, from the “inner aspect-toch-תוך” of doing them not for the sake of HaShem, he comes to do them for the sake of HaShem.” For, the good deed, of doing the mitzvah itself, also effects good vessels Above, and in thought, the “inner aspect-toch-תוך” of the vessels is made. That is, in his heart of hearts, every Jew desires to serve HaShem for His sake only.
footnotes: ²⁰⁹ Talmud Bavli, Pesachim 50b