I should have deemed it once an effort vain <br />To sweeten more sweet Maro's matchless strain, <br />But from that error now behold me free, <br />Since I received him as a gift from thee.<br /><br />William Cowper<br /><br />http://www.poemhunter.com/poem/on-receiving-heyne-s-virgil-from-mr-hayley/