'Careful' in the Bible

This set of instructions is not to cease being a part of your conversations. Meditate on it day and night, so that you may be careful to carry out everything that's written in it, for then you'll prosper and succeed.

Only be very careful to keep the commands and the Law that Moses the servant of the LORD commanded you that is, to love the LORD your God, to follow in all of his ways, to keep his commands, to stay close to him, and to serve him with all your heart and soul."