All his life, he practised the greatest austerity and it was chiefly in assiduous prayer that he was inflamed with ardent love for God and devotion to his neighbour. He was called by Eugenius IV to share in the full power of Christ's priesthood: he was made patriarch of Grado, but transferring the see to Venice in 1451, he became the first patriarch of this city. He died in 1455, saying: "I am going to Thee, O good Jesus."
Statuit ei Dominus testamentum pacis, et principem fecit eum: ut sit illi sacerdotii dignitas in aeternum. * Memento Domine David et omnis mansuetudinis ejus.
The Lord made to him a covenant of peace, and made him a prince; that the dignity of the priesthood should be to him for ever. * O Lord, remember David: and all his meekness.
(Ecclus. 45:30 and Psalm 131:1. From the Introit at Mass).
Da, quǽsumus, omnípotens Deus: ut beáti Laurentii Confessóris tui atque Pontíficis veneránda sollémnitas, et devotiónem nobis áugeat et salútem.
From the Catholic Encyclopaedia: http://www.newadvent.org/cathen/09091a.htm