פירוש על קידושין 65:19

Jews recite the Shema in praise of God twice a day. A Torah scholar should not rise before his teacher more than twice a day so that the teacher’s honor not supersede that of God. I think we can sense here that rabbis were accorded a high level of honor, and that there was a fear that this honor would exceed proper boundaries and perhaps the students would revere their teacher’s more than God. It is this mentality that R. Yannai is trying to curb.