Signs of successful prayer

Hi,

"If a person prays and errs, it is a bad sign for him. If he is the Chazan, it is a bad sign for those who sent him, for one’s agent is like himself.

"They say of Rabbi Chanina ben Dosa that he would pray for the ill and say, ‘This one will live, this one will die.’ They asked, ‘How do you know?’ To which he replied, ‘If my prayer is smooth in my mouth, I know it is received. If not, I know it has been torn up.’"

(Talmud, Berachot 34b)

Have a great day,
Mordechai