8 7 ) ▁attack ing ▁John ▁D ry den , ▁whom ▁he ▁called ▁a ▁" gr im ▁logic ian ". ▁D ry den ▁ret ali ated , ▁and ▁incorpor ated ▁the ▁" gr im ▁logic ian " ▁phrase ▁as ▁self - description ▁in ▁his ▁poem ▁The ▁H ind ▁and ▁the ▁Pan ther ▁( 1 6 8 7 ), ▁which ▁all udes ▁to ▁St illing f le et . ▁ ▁Philosoph ical ▁controvers y ▁A ▁Let ter ▁to ▁a ▁De ist ▁( 1 6 7 7 ) ▁was ▁the ▁first ▁prolong ed ▁attack ▁on ▁de ism ▁to ▁appear ▁in ▁English . ▁It ▁also ▁engaged ▁with ▁the ▁thought ▁of ▁Bar uch ▁Sp ino za , ▁in ▁T ract atus ▁The olog ico - Pol it icus , ▁though ▁he ▁was ▁named ▁only ▁as ▁a ▁" late ▁author ▁might ily ▁in ▁v og ue ". ▁ ▁In ▁ 1 6 9 7 , ▁St illing f le et ▁issued ▁A ▁Disc ourse ▁in ▁V ind ic ation ▁of ▁the ▁Do ctrine ▁of ▁the ▁Tr inity ▁( 1 6 9 7 ) ▁ ▁It ▁had ▁three ▁intent ions : ▁rep elling ▁the ▁Unit ari ans , ▁sh oring ▁up ▁the ▁unity ▁of ▁the ▁orth odox ▁tr init ari ans , ▁and ▁do ctr inal ▁defence ▁of ▁the ▁Tr inity . ▁Under ▁the ▁third ▁heading , ▁St illing f le et ▁took ▁on ▁John ▁Lock e , ▁and ▁his ▁Ess ay ▁on ▁Human ▁Under standing . ▁He ▁wrote ▁Three ▁Crit ic isms ▁of ▁Lock e ▁( 1 6