When Israelites came into the desert of Zin. There was no water for them. Then Moses and Aaron prayed to God and God told Moses to Knock the Rock (Number 20:8-11). In the Testament of Grace Christ Jesus is our Rock (Psalm 18:2). Jesus too have the living water in him (John 7:37; Revelation 22:17). What we need to do is just Knock our Rock. If you are in desert of illness, poverty, grief and pain just knock our rock with Prayer and you will get the answer like waterfall.