Ephesians 5:17

Wherefore be ye not unwise, hut understanding what is the will of the Lord. The "wherefore" bears on all the preceding argument: because ye are children of light; because light is so valuable and so indispensable; because your whole circumstances demand so much care and earnestness. "Unwise" is equivalent to senseless; "understanding," to both knowing and laying to heart, as in parable of sower: "When any one heareth the word of the kingdom, and understandeth it not," i.e. does not consider or ponder it, "then cometh the wicked one," etc. The will of the Lord is the great rule of the Christian life; to know and in the deeper sense understand this, is to walk wisely and to walk surely.