'Watchful' in the Bible

Only, be very watchful to do the command and the law which Moses, servant of Jehovah, commanded you, to love Jehovah your God, and to walk in all His ways, and to keep His commands, and to cleave to Him, and to serve Him, with all your heart, and with all your soul.'

and ye have been very watchful for yourselves to love Jehovah your God.