It was during this period that Sidney signed the visitor's book at the University of Copenhagen with: "PHILIPPUS SIDNEY MANUS HAEC INIMICA TYRANNIS ENSE PETIT PLACIDAM CUM LIBERTATE QUIETEM" ("This hand, enemy to tyrants, by the sword seeks peace with liberty").
Během tohoto období Sidney podepsal návštěvní knihu na Univerzitě v Kodani slovy: "PHILIPPUS SIDNEY MANUS HAEC INIMICA TYRANNIS ENSE PETIT PLACIDAM CUM LIBERTATE QUIETEM" ("Tato ruka, nepřítel tyranů, mečem hledá mír a svobodu").