Welcome to our special edition on חובות הלבבות, שער חשבון הנפש (Duties of the Heart, The Gate of Self-Accounting), where we are discussing the eighth principle. This section of the book acts as a practical application of the concepts discussed in earlier chapters. Here, the author explores two distinct but related concepts of יחוד (Yichud), which means "oneness." The Two Concepts of Oneness The first concept is שער יחוד השם (The Gate of God's Oneness). This refers to the intellectual and emotional understanding that God is one and there is no other. This core belief is so fundamental that it is encapsulated in the first two of the Ten Commandments: "I am Hashem, your God," and "You shall have no other gods besides Me." As Rabbeinu Asher (the Rosh) teaches, for a Jew, belief in God is not a general concept; it must be a belief in the God of the Exodus from Egypt. This means recognizing that God is in complete control, down to the smallest detail of our lives, leaving no room for coincidence or human-attributed causes. This belief in God's oneness also means understanding that He has no physical form, likeness, or limitations. Furthermore, all the titles we attribute to Him—such as merciful, loving, or just—are His exclusively. While we are commanded to emulate these qualities, their true essence belongs only to God. The second concept is שער יחוד המעשה (The Gate of Oneness in Action). This refers to the necessary oneness of our own hearts in our service to God. Our intentions must be singularly focused on serving Him for His sake alone, not for personal gain or to avoid negative consequences in this world or the next. As the Mishnah in Pirkei Avot teaches, we should not serve our Master in order to receive a reward. While a reward will certainly come, it should not be our primary motivation. The Danger of Ulterior Motives The author provides a powerful analogy to illustrate this point. I will expound on it , Imagine a husband gives his wife a fur coat. If she discovers he did it with the hidden agenda of convincing her to move, her joy would turn to disappointment. Similarly, a boss would be offended to find his employee's gift was merely a calculated attempt to get a raise. These examples highlight a critical lesson: even with human relationships, we are hurt by ulterior motives. With God, who sees the innermost secrets of our hearts and has no need for us, our intentions must be pure. We should feel a sense of shame at the thought of serving God for personal gain. This idea is central to the High Holidays, when we crown God as King. The Zohar criticizes those who approach this period with self-serving demands, "barking like dogs" for wealth or children without truly focusing on God Himself. This lesson serves as a call to action—a spiritual reset. We must shift our focus to performing mitzvot for their own sake and studying Torah for its own sake. This is the essence of the eighth principle of self-accounting.