ויברכו את רבקה ויאמרו לה אחתנו את היי לאלפי רבבה ... (כד-ס)
Rashi quotes the Medrash that explains how Eliezer ran to greet Rivka because he saw how the water miraculously rose up to her from the well. However, it was not on this premise that he chose her as a wife for Yitzchok. The Beis Halevi zt”l explains that although this was a clear sign that she was worthy of miracles performed for her, Eliezer needed to see in the future wife of Yitzchok, the future daughter-in-law of Avraham Avinu, a trait that would be the foundation of Klal Yisroel, one that would sustain them even in their darkest hour. The kindness, love and unity of Jews is truly our greatest power as it works measure for measure. Our kindness towards others then opens up the flow of Hashem’s mercy and kindness to us.
Dovid Hamelech teaches us in Tehillim: "עולם חסד יבנה" - the world is built upon kindness. In the times of Noach, when the world was devoid of loving kindness, Hashem destroyed it and began all over again. He saved Noach and his family and gave him an intensive seminar on how to “give unconditionally” in the ark, where he was busy around the clock caring for the animals. In order to begin the world again it would have to be done on the foundation - on the very premise - of kindness.
For this reason, Eliezer looked for chessed for he knew that his choice of mate for Yitzchok would be planting the seeds for all future generations of Jews. He understood that being worthy of miracles was not enough; embodying the trait that the entire world is built upon, the middah of chessed, is all the more important. Eliezer was not just looking for a בעלת חסד but a wife who truly loved to do chessed. He wished to find a person who saw chessed as an emulation of Hashem’s unlimited kindness. This is the manner how Eliezer chose Rivkah; from a simple act of chessed - giving a stranger a drink - she was zoche to marry Yitzchok Avinu and shape the destiny of the Jewish people for every generation to follow.
So the next time you meet a thirsty man with a bunch of camels at an oasis in the desert, offer him a drink - you never know!