Prayer for others which is made gently and with deep love is selfless and has great spiritual benefit. It brings grace to the person who prays and also to the person for whom he is praying. When you have a great love and this love moves you to prayer, then the waves of love are transmitted and affect the person for whom you are praying and you create around him a shield of protection and you influence him, you lead him towards what is good. When He sees your efforts, God bestows His grace abundantly on both you and on the person you are praying for. But we must die to ourselves. Do you understand?
You get upset when others are unwell, whereas what you should do is devote yourself to prayer so that what is desired comes about through the grace of God. With your own wisdom, you tell others what should be done, when that is not necessarily the best thing. The secret is to be found elsewhere, and not in what we say or suggest to others. The secret lies in our devotion, our prayer to God for what is best for our brethren to come about through the grace of God. That is the best. What we are unable to do will be done through His grace.