17 He exists before all things and in him all things hold together,18 and he is the Head of the Body, that is, the Church. Responsorial Psalm, Psalms 100:1, 2, 3, 4, 51 [Psalm For thanksgiving] Acclaim Yahweh, all the earth,2 serve Yahweh with gladness, come into his presence with songs of joy! 3 Be sure that Yahweh is God, he made us, we belong to him, his people, the flock of his sheepfold. 4 Come within his gates giving thanks, to his courts singing praise, give thanks to him and bless his name! 5 For Yahweh is good, his faithful love is everlasting, his constancy from age to age.