One should not stand up to say Tefillah except in a reverent state of mind. The pious men of old used to wait an hour before praying in order that they might direct their thoughts to God. Even if a king greets him [while praying] he should not answer him: even if a snake is wound round his heel he should not stop.

The one who says, “On a bird’s nest may Your mercy be extended,” [or] “For good may Your name be blessed” or “We give thanks, we give thanks,” they silence him. One who was passing before the ark and made a mistake, another should pass in his place, and he should not be as one who refuses at that moment. Where does he begin? At the beginning of the blessing in which the other made a mistake.

The one who passes before the ark should not respond Amen after [the blessings of] the priests because this might confuse him. If there is no priest there except himself, he should not raise his hands [to recite the priestly blessing], but if he is confident that he can raise his hands and go back to his place in his prayer, he is permitted to do so.

One who is praying and makes a mistake, it is a bad sign for him. And if he is the messenger of the congregation (the prayer leader) it is a bad sign for those who have sent him, because one’s messenger is equivalent to one’s self. They said about Rabbi Hanina ben Dosa that he used to pray for the sick and say, “This one will die, this one will live.” They said to him: “How do you know?” He replied: “If my prayer comes out fluently, I know that he is accepted, but if not, then I know that he is rejected.”