When I lived up north I attended a Day of Prayer conducted by a priest that came to the area where I lived once a month. There was two conferences, Mass, and fifteen minutes of silent listening to the Lord after receiving the Holy Eucharist. Afterwards, those present shared many things.
At these Days of Prayer that I attended over the years I have witnessed healings of the spirit that stemmed from traumatic events in the past, and physical healings which were shared from the prior month of prayer time.
Many times these healings of body and spirit occur when believers come together to pray for someone… The result of the prayers are shared at a future time. Sometimes they happen to individuals privately, and they share them with the group.
The greatest power in the world is God’s Love, when we allow it to flow through us to others.
What I described above is not the only place where I have been privy to signs and wonders.