Baal HaSulam, “Matan Torah (The Giving of the Torah),” Item 14: This is because the work in Mitzvot between man and God is fixed and specific, and is not demanding, and one becomes easily accustomed to it, and everything that is done out of habit is no longer useful.
But the Mitzvot between man and man are changing and irregular, and demands surround him wherever he may turn. Hence, their cure is much more certain and their aim is closer.
We cannot reach the Creator. We cannot feel Him and check if we are acting correctly or not in regard to Him, or how He reacts. As long as our desire is not really ready, we are not prepared to hear, see, or feel Him in any form.
Even to attain the first level of spirituality of Nefesh de Nefesh requires preparing a complete desire for the level of zero with its ten Sefirot. But we don’t know how to approach this, how to begin, how to pass through half or a quarter of the way in order to prepare a vessel in this manner.
We never have the ability to feel the Creator and His attitude towards us before we become ready for this kind of connection. So we work with the shattered vessel that was given to us. Through our gathering of its parts, connecting in the right form, and by relating to each other with a true intention, we discover our connection with the Creator through intentions of bestowal and connection with our friends.
Through mutual relationships with the friends, I attain a vessel that is more linked, more complex, more connected, and within it, I discover the Creator. We have no possibility of working directly with the Creator but only through the correction of the vessel in which we clarify our mutual relationship with the friends, all its pros and cons, and we understand only how to react and behave to achieve the right connection.
From the 2nd part of the Daily Kabbalah Lesson 5/25/14, Writings of Baal HaSulam