1. RABASH, Letter No. 42
It is written, “And the people encamped, as one man with one heart.” This means that they all had one goal, which is to benefit the Creator.
2. RABASH, Letter No. 42
How they could be as one man with one heart, since we know what our sages said, “As their faces are not similar to one another, their views are not similar to one another,” so how could they be as one man with one heart?
Answer: If we are saying that each one cares for himself, it is impossible to be as one man, since they are not similar to one another. However, if they all annul their selves and worry only about the benefit of the Creator, they have no individual views, since the individuals have all been canceled and have entered the single authority.
3. RABASH, Letter No. 34
“To do Your will wholeheartedly.”
This is so because while there is not just one society, it is difficult to work wholeheartedly. Instead, part of the heart remains for its own benefit and not for the benefit of the Creator.
4. RABASH, Letter No. 40
Through the friction of the hearts, even of the strongest ones, each will bring out warmth from the walls of his heart, and the warmth will ignite the sparks of love until a clothing of love will form. Then, both of them will be covered under one blanket, meaning a single love will surround and envelop the two of them, as it is known that Dvekut [adhesion] unites two into one.
5. Avodat Israel [The Work of Israel], Portion Shlach
The righteous serves his Creator in a different style, they all aim at the same thing—their father in Heaven. They gather and assemble one by one, as one man with one heart, and each one diminishes himself and glorifies the work for the sake of the Creator, who gives him the strength and intelligence by which to serve Him. Hence, one will not be arrogant toward his friend, and they are in the world of straightness and unite with one another.
6. RABASH, Letter No. 24
You must awaken the heart of the friends until the flame rises by itself […] By that, you will be rewarded with awakening the love of the Creator upon us.
7. RABASH, Article 13 (1984), "Sometimes Spirituality Is Called 'a Soul'"
We must always awaken what the heart forgets, what is needed for the correction of the heart—Love of friends—whose purpose is to achieve love of others.
This is not a pleasant thing for the heart, which is called “self-love.” Hence, when there is a gathering of friends, we must remember to bring up the question, meaning each one should ask himself how much we have advanced in love of others, and how much we have done to promote us in that matter.
8. Maor VaShemesh, Ki Tetze
Repentance is mainly in uniting with each and every one in love and in one heart, to serve the Creator shoulder to shoulder. […] As was said, “And all are reviewed in one review.” This means that we should adhere and connect to one another and close into one another in the heart of each one. This is implied in the word “one,” to become one bundle to serve the Creator wholeheartedly.
9. Baal HaSulam, Letter No. 47
Let me remind you the validity of love of friends in spite of everything at this time, for it is upon this that our right to exist depends, and upon this our near-to-come success is measured.
Hence, turn away from all the imaginary engagements and set your hearts on thinking thoughts and devising proper tactics to truly connect your hearts as one, so the words “Love your friend as yourself” will literally come true in you.
10. Rabbi Elimelech of Lizhensk, Noam Elimelech [The Pleasantness of Elimelech]
Brace our ties of love to You, as it is known to You that all will be for bringing contentment to You, and this is our main intention. And should we not have the wit to aim our hearts to You, You will teach us, so we may truly know the aim of Your good will.