Why do we lift our hands?
"Lift up your hands in the sanctuary and bless the Lord." (Psalm 134:2)
Why do we have audible praise?
"I will bless the Lord at all times: His praise shall continually be in my mouth. (Psalm 34:1)
Why does the whole Church pray at once for specific needs?
"And when they heard that, they lifted up their voice to God with one accord, and said, Lord, thou art God, which hast made heaven and earth..." (Acts 4:24)