One of the principles of prayer is that it is impossible to have necessary fervour, empathy, and deep concentration, in prayer unless one has good relations with the person who asks for the prayer.
It is mentioned about a saint that once he was travelling and a boy fell in front of him and fractured his leg. It created anguish in the saint’s heart. He prayed and requested God to heal the boy’s leg saying why did otherwise He created agony in his [saint’s] heart.
(Malfuzat, Vol. 9, p. 49)