John 6:54 Meaning

52The Jews therefore strove among themselves, saying, How can this man give us his flesh to eat?

53Then Jesus said unto them, Verily, verily, I say unto you, Except ye eat the flesh of the Son of man, and drink his blood, ye have no life in you.

54Whoso eateth my flesh, and drinketh my blood, hath eternal life; and I will raise him up at the last day.

55For my flesh is meat indeed, and my blood is drink indeed.

56He that eateth my flesh, and drinketh my blood, dwelleth in me, and I in him.