Okay, so basically, these verses are telling us to follow our Lord in his methods of proving "how much we love"
Mar 8:34 And when he had called the people [unto him] with his disciples also, he said unto them, Whosoever will come after me, let him deny himself, and take up his cross, and follow me.
Gal 2:20 I am crucified with Christ: nevertheless I live; yet not I, but Christ liveth in me: and the life which I now live in the flesh I live by the faith of the Son of God, who loved me, and gave himself for me.
Gal 5:24 And they that are Christ's have crucified the flesh with the affections and lusts.
Jhn 3:16 For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life.
God so loved the world...do we love the world?
Gal 6:14 But God forbid that I should glory, save in the cross of our Lord Jesus Christ, by whom the world is crucified unto me, and I unto the world.