SRL for [careful]: One must always be [careful] of books , said Tessa , and what is inside them , for words have the power to change us .
ARG-0: One | ARG-M-MOD: must | ARG-M-TMP: always | ARG-1: of books | ARG-M-CAU: for words have the power to change us | C-ARG-1: and what is inside them