Ground was officially broken for Oral Roberts University in 1962 in the southern part of Tulsa, Oklahoma. The university received its charter the following year from the State of Oklahoma and Oral Roberts University officially opened in 1965 with an enrollment of 300 students and seven major completed buildings. The university was founded by Oral Roberts "as a result of the evangelist Oral Roberts' obeying God’s mandate to build a university on God’s authority and the Holy Spirit. God’s commission to Oral Roberts was to 'Raise up your students to hear My voice, to go where My light is dim, where My voice is heard small, and My healing power is not known, even to the uttermost bounds of the earth. Their work will exceed yours, and in this I am well pleased'." Roberts placed special importance on the Prayer Tower, even though the concept of a building specifically dedicated to prayer at the center of the campus caused considerable tension, as some academic leaders were afraid the school would be unable to receive accreditation with such a building. But the tower, designed by architect Frank Wallace, was completed in 1967 at a cost of $2 million, a further source of contention. After its completion, Roberts called for a three-day period of prayer and fasting. At the university's dedication ceremony in 1967, the evangelist Billy Graham was the keynote speaker.