Prayers can do as much as God can do. Prayer changes everything. It changes situations for us, it causes miracles but above all it changes us into the likeness of the one we are praying to.
Do not be anxious about anything, but in every situation, by prayer and petition, with thanksgiving, present your requests to God.
Then you will call on me and come and pray to me, and I will listen to you.
He will respond to the prayer of the destitute; he will not despise their plea.
1 Thessalonians 5:16-18
16 Rejoice always,
17 pray continually,
18 give thanks in all circumstances; for this is God’s will for you in Christ Jesus.
But when you pray, go into your room, close the door and pray to your Father, who is unseen. Then your Father, who sees what is done in secret, will reward you.
Therefore I say unto you, What things soever ye desire, when ye pray, believe that ye receive them, and ye shall have them.