 Boyle, too, held that design arguments were both available and the most likely to persuade rational, open-minded hearers. Such arguments were intended to form a large part of a book on atheism, something he worked on throughout his adult life but never published, though parts of it were used in various other works of a theological  nature.[21]  Boyle did, however, leave a plan of the intended work, and in the manuscript remains — seven volumes of correspondence, forty-six volumes of miscellaneous papers and eighteen volumes of notebooks — there are still a number of unpublished fragments and some longer selections which he intended for this work.