Hereby perceive we the love of God, because he laid down his life for us: and we ought to lay down our lives for the brethren. ~ 1 John 3:16 KJV

By this we come to know (progressively to recognize, to perceive, to understand) the [essential] love: that He laid down His [own] life for us; and we ought to lay [our] lives down for [those who are our] brothers [in Him]. ~ 1 John 3:16 AMP