If someone asks you to pray for a sick relative or a special concern they have and you don't because you figure your prayer doesn't really make a difference, are you doing Jesus' will?

If someone asks you to pray for a sick relative or a special concern they have and you don't because you figure your prayer doesn't really make a difference, are you doing Jesus' will?

Confess your faults one to another, and pray one for another, that ye may be healed. The effectual fervent prayer of a righteous man availath much. James 5:16

One thing you have to know is that in Hebrews 6:18 it says that it is impossible for God to lie. If Jesus tells us through the Bible in James 5:16 The effectual fervent prayer of a righteous man availath much, then we are missing the mark if we don't find time to pray on their behalf. We never know the final outcome, but Jesus does!