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Schnackenburg draws our attention to the fact that all these images are “variations on the single theme, that Jesus has come so that human beings may have life, and have it in abundance (cf. Jn 10:10). His only gift is life, and he is able to give it because the divine life is present in him in original and inexhaustible fullness” (Barrett, Gospel, II, p. 88). In the end, man both needs and longs for just one thing: life, the fullness of life—“happiness.” In one passage in John’s Gospel, Jesus calls this one simple thing for which we long “perfect joy
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Pope Benedict XVI (Jesus of Nazareth: From the Baptism in the Jordan to the Transfiguration)