Recently as per one news item "Prayers really can heal the sick":
"Prayers can heal the sick, especially if the well-wisher is standing near the person he or she is praying for, says a team of researchers from Indiana University in the US. Researchers say the vision and hearing of patients in their tests improved after healing practitioners prayed for them.
One elderly woman who could not see a person’s hand when they held two fingers up in front of her face from a foot away, is said to have been cured after a healer placed their hands over her eyes and prayed for less than one minute, reports the Daily Mail.
Researchers found that some subjects with impaired hearing could hear better after prayers and other subjects had their tested vision improved."
So Let's pray to God with our heart & God shall have mercy on us. A simple prayer is enough for the God to become Happy with us. Below verse of Bhagwat Gita ensures that only:
"man-mana bhava mad-bhakto
mad-yaji mam namaskuru
mam evaishyasi satyam te
pratijane priyo ’si me" (Bhagwat Gita: Chapter Eighteen verse 65)
"Lord Sri Krishna said: O Arjuna, Always think of Me, become My devotee, worship Me and offer your homage unto Me. Thus you will come to Me without fail. I promise you this because you are My very dear friend."
Below is a beautiful quote about the Prayer:
God looks not at the oratory of your prayers, how elegant they may be; nor at the geometry of your prayers, how long they may be; nor at the arithmetic of your prayers, how many they may; not at logic of your prayers, how methodical they may be; but the sincerity of them He looks at. -T. Brooks