“ For example, for the blessing of Chonein Hadaat: "You inbue man with knowledge. You are the Source of all blessing, Hashem, Who imbues knowledge." According to the other opinion, the first three and last three blessings (the "Praise" and "Thanksgiving" groups, respectively) are said in their full form; however, the thirteen "Supplicationary" blessings in the middle are replaced with a single blessing, called Havineinu, which incorporates the main ideas of all thirteen blessings into one. ”

“ Hebrew Text
רבן גמליאל אומר: בכל יום מתפלל אדם שמונה עשרה. רבי יהושע אומר: מעין שמונה עשרה. רבי עקיבא אומר: אם שגורה תפלתו בפיו – יתפלל שמונה עשרה; ואם לאו – מעין שמונה עשרה. English Translation Rabban Gamliel says: Every day a person must pray eighteen [blessings of the Amidah] . ”