In this week's parsha the Torah teaches us in great length the story of Eliezer's search for a match for Yitzchok. It tells of Eliezer's travels to Aram Nahara'im and how he found Rivka in a miraculous way. After being invited into Rivka's home, Eliezer relates his whole saga to Rivka's family. Once again, the Torah goes into great detail, repeating the entire episode in Eliezer's narrative.
The Torah could have simply stated that Eliezer told them everything that had transpired. Why the need to repeat? Rashi answers this question by citing a medrash: "The conversations of the servants of the patriarchs are more pleasing before Hashem than the Torah of their descendants." In contrast, for example, many important halachos, such as the 39 melachos of Shabbos, are just hinted to in the Torah.
The Chasam Sofer expounds on this idea as follows. There are two reasons why Hashem is brief in the Torah. One is because of His humility, i.e. he wrote the Torah in a succinct fashion, so as not to burden us with more. A second reason, says the Chasam Sofer, is that Hashem wanted us to toil in the study of the Torah so that He could rejoice in our effort to understand even the hints and nuances therein. This is to our benefit, since He gives us greater reward for our work. On the other hand, the conversations of the slaves of the patriarchs, and certainly the conversations of their descendants, are deliberately recounted at length. This is because of the delight Hashem has in saying over His children's accomplishments. Similarly, the Yalkut Me'am Loez explains, that by detailing the conversations of the slaves of the patriarchs, it shows how precious the patriarchs were to Hashem.
An additional explanation is given that the reason the Torah expanded the stories of our forefathers, is for the deep lessons that we learn out of them.
On this reasoning The Nesivos Shalom asks: What can we learn from the words of Eliezer, who seemed to be just a servant? If the Torah repeats his whole conversation, his words must have much importance. But how can it be that Eliezer's words carry the same importance as the words of the Avos?
The Nesivos Shalom answers, this itself teaches us a very important lesson. The halacha is
"Kol hamechubar l'tahor-tahor," Everything attached to the ritually pure, is [itself] pure." This halacha can be applied conceptually as well. Anyone who attaches himself to a person who is holy and pure, becomes holy and pure himself. Eliezer was totally subservient to Avraham. His whole essence was to do Avraham's will, with no sense of self. In the parasha he is referred to only as "the servant." That is also how he introduces himself to Rivka's family. His attachment to Avraham put him, in some way, on the same level as Avraham. Therefore, his words and actions also became holy and pure, and that is why we can learn great lessons from him, just like we learn from the words of our forefathers.
This is a lesson for us all. If we attach ourselves to a Rav or a Rebbi, form a relationship with them and are mevatel da'as to them, that connection will elevate us, and since they are greatly connected to Hashem, we too get connected to Hashem.