Rabban Yochanan ben Zakkai received [the tradition] from Hillel and Shammai. He used to say: If you have studied much To-rah, do not take credit for yourself, because that is [the purpose] for which you were created. Rabban Yochanan ben Zakkai had five disciples. They were: R' Eliezer ben Hyrkanos, R' Yehoshua ben Chananiah, R' Yose the Kohen, R' Shimon ben Nesanel, and R' Elazar ben Arach. He used to enumerate their praises: R' Eliezer ben Hyrkanos is [like] a cemented cistern that does not lose a drop. R' Yehoshua ben Chananiah: fortunate is she who bore him. R' Yose the Kohen is a scrupulously pious person. R' Shimon ben Nesanel fears sin. And R' Elazar ben Arach is like a spring flowing stronger and stronger.  He used to say: If all the sages of Israel were on one pan of a balance scale, and Eliezer ben Hyrkanos were on the other, he would outweigh them all. Abba Shaul said in [Rabban Yochanan's] name: If all the sages of Israel with even R' Eliezer ben Hyrkanos among them were on one pan of a balance scale, and R' Elazar ben Arach on the other, he would outweigh them all.