Stratfordian scholars also cite Occam's razor, the principle that the simplest and best-evidenced explanation (in this case that the plays were written by Shakespeare of Stratford) is most likely to be the correct one. A critique of all alternative authorship theories may be found in Samuel Schoenbaum's "Shakespeare's Lives". Questioning Bacon's ability as a poet, Sidney Lee asserted: "[...] such authentic examples of Bacon's efforts to write verse as survive prove beyond all possibility of contradiction that, great as he was as a prose writer and a philosopher, he was incapable of penning any of the poetry assigned to Shakespeare."