No obligation created by the Board of Trustees pursuant to this act shall ever result in the creation of a debt against the State of Illinois, but all such obligations, including principal and interest, shall be payable under any and all contracts which the Board of Trustees of the University of Illinois may enter into with the United States hereunder, solely from income derived from sources other than general taxation, such as receipts from operation, fees and other incidental collections and receipts, including gifts or bequests.
110 ILCS 410/2