παρέχειν ἑαυτόν
From LSJ
Πρόσεχε τῷ ὑποκειμένῳ ἢ τῇ ἐνεργείᾳ ἢ τῷ δόγματι ἢ τῷ σημαινομένῳ. → Look to the essence of a thing, whether it be a point of doctrine, of practice, or of interpretation.
Greek > English (Woodhouse)
acquit oneself, hand oneself over to, make oneself, prove oneself, quit oneself, resign oneself to, show oneself, throw oneself on
