We do not prevail with strength but it is by "Faith"
Hannah the wife of a King had a 'sorrowful spirit' because her womb was closed and she could not bare a child. So she prayed to God for a child. God blessed her to give birth to a son. She named him Samuel. It was due to her devout spirit in God through the medium of prayer. (I Samuel 1st, 2nd and 3rd chapters).
Through faith we grow in statue, and experience the "favor" of the Lord. Hannah after giving birth to Samuel, also dedicated him back to God. The essence and premise by which we sprinkle a "new born baby" with water in a traditional baptismal or christening worship service ceremony.