es ▁sent ▁him ▁on ▁various ▁honor able ▁miss ions , ▁such ▁as ▁bearing ▁the ▁cardinal ' s ▁hat ▁to ▁the ▁nun cio ▁at ▁Wars aw ▁in ▁ 1 6 2 9 , ▁and ▁Alexander ▁VII ▁sent ▁him ▁to ▁In ns b ruck ▁to ▁receive ▁the ▁formal ▁ab j uration ▁of ▁Protest ant ism ▁from ▁Christ ina , ▁former ▁Queen ▁of ▁Sweden . ▁He ▁also ▁acted ▁as ▁inter medi ary ▁in ▁the ▁conversion ▁of ▁the ▁Dan ish ▁no blem an , ▁Friedrich , ▁Land gra ve ▁of ▁Hessen - D arm stadt ▁and ▁of ▁Christoph , ▁Graf ▁von ▁R ant z au . ▁ ▁Most ly , ▁however , ▁he ▁was ▁occupied ▁with ▁his ▁studies . ▁Hol sten ius ▁formed ▁great ▁projects . ▁He ▁was ▁a ▁man ▁of ▁un we ar ied ▁industry ▁and ▁immense ▁learning , ▁but ▁he ▁lack ed ▁the ▁persist ency ▁to ▁carry ▁out ▁the ▁vast ▁literary ▁schemes ▁he ▁had ▁planned . ▁Among ▁them , ▁he ▁desired ▁to ▁correct ▁Philipp ▁Cl ü ver ' s ▁errors ▁and ▁complete ▁his ▁work ; ▁to ▁edit , ▁translate ▁and ▁comment ▁the ▁works ▁of ▁the ▁Ne op lat on ists ; ▁to ▁form ▁a ▁collection ▁of ▁the ▁un ed ited ▁hom il ies ▁of ▁the ▁Greek ▁F athers ; ▁to ▁collect ▁ins cri ptions ; ▁to ▁write ▁a ▁critical ▁comment ary ▁on ▁the ▁Greek ▁text ▁of ▁the ▁Bible ; ▁to ▁form ▁a ▁collection ▁of ▁all ▁the ▁monuments ▁and ▁acts ▁of ▁the ▁history ▁of ▁the ▁pop es . ▁These ▁diverse ▁undert ak ings ▁consum ed ▁his