One who prays for something that has already happened. For example, he entered the city and heard a cry in the city and he prayed "may it be God's will that this cry is not from a member of my household" or if his his wife was expecting and more than forty days had passed and he said "may it be God's will that my wife will give birth to a boy - behold this is a meaningless prayer. Rather a person should always pay for the future and give thanks for the past...
One who goes to measure his grain says "May it be You will, Hashem my God, that you send blessing to this pile" after he begins measuring he says "Blessed is the One who sends / sent blessing to this pile" if after he measured he recited the blessing, it's an empty blessing for blessing rests only on that which is hidden from the eye.
The one who enters the bathhouse should say: May it be your will, my God, that you bring me into peace and bring me out into peace, and save me from this light." When he comes out in peace he says, "I thank you, my God, that you saved me from this light."
One who goes to let blood should say: May it be Your will, my God, that this be an action of healing, for You heal freely. After the bloodletting, say: Blessed... is the healer of the sick.
One should be accustomed to say: All that God does is for the best!
