Pirkei Avos Chabura #3

Antigonus a man of Socho received [the oral tradition] from Shimon the Righteous. He used to say: do not be like servants who serve the master in the expectation of receiving a reward, but be like servants who serve the master without the expectation of receiving a reward, and let the fear of Heaven be upon you.

Honor your father and your mother, as your God יהוה has commanded you, that you may long endure, and that you may fare well, in the land that your God יהוה is assigning to you.

But isn’t it taught in a baraita that one who says: I am contributing this sela to charity so that my sons will live, or if he says: I am performing the mitzva so that I will merit a share in the World-to-Come, this person is a full-fledged righteous person!

A person should not say: "I will fulfill the mitzvot of the Torah and occupy myself in its wisdom in order to receive all the blessings which are contained within it or in order to merit the life of the world to come." "[Similarly,] I will separate myself from all the sins which the Torah warned against so that I will be saved from all the curses contained in the Torah or so that [my soul] will not be cut off from the life of the world to come." It is not fitting to serve God in this manner. A person whose service is motivated by these factors is considered one who serves out of fear. He is not on the level of the prophets or of the wise. The only ones who serve God in this manner are common people, women, and minors. They are trained to serve God out of fear until their knowledge increases and they serve out of love. One who serves [God] out of love occupies himself in the Torah and the mitzvot and walks in the paths of wisdom for no ulterior motive: not because of fear that evil will occur, nor in order to acquire benefit. Rather, he does what is true because it is true, and ultimately, good will come because of it. This is a very high level which is not merited by every wise man. It is the level of our Patriarch, Abraham, whom God described as, "he who loved Me," for his service was only motivated by love. God commanded us [to seek] this rung [of service] as conveyed by Moses as [Deuteronomy 6:5] states: "Love God, your Lord.'' When a man will love God in the proper manner, he will immediately perform all of the mitzvot motivated by love. What is the proper [degree] of love? That a person should love God with a very great and exceeding love until his soul is bound up in the love of God. Thus, he will always be obsessed with this love as if he is lovesick. [A lovesick person's] thoughts are never diverted from the love of that woman. He is always obsessed with her; when he sits down, when he gets up, when he eats and drinks. With an even greater [love], the love for God should be [implanted] in the hearts of those who love Him and are obsessed with Him at all times as we are commanded [Deuteronomy 6:5: "Love God...] with all your heart and with all soul." This concept was implied by Solomon [Song of Songs 2:5] when he stated, as a metaphor: "I am lovesick." [Indeed,] the totality of the Song of Songs is a parable describing [this love]. The Sages of the previous generations declared: Should one say: "I will study Torah in order that I become wealthy, in order that I be called a Rabbi, or in' order that I receive reward in the world to come?" The Torah teaches [Deuteronomy 11:13]: "[If you are careful to observe My commandments...] to love God; [implying] that all that you do should only be done out of love. The Sages also said: [Psalms 112:1 instructs:] "Desire His commandments greatly." [Desire His commandments] and not the reward [which comes from] His commandments. In a similar manner, the great Sages would command the more understanding and brilliant among their students in private: "‘Do not be like servants who serve their master [for the sake of receiving a reward].’ Rather, since He is the Master, it is fitting to serve Him;" i.e., serve [Him] out of love.