Origen

So, when a ship has overcome the dangers of the sea, although the result be accomplished by great labour on the part of the sailors, and by the aid of all the art of navigation, and by the zeal and carefulness of the pilot, and by the favouring influence of the breezes, and the careful observation of the signs of the stars, no one in his sound senses would ascribe the safety of the vessel, when, after being tossed by the waves, and wearied by the billows, it has at last reached the harbour in safety, to anything else than to the mercy of God. Not even the sailors or pilot venture to say, I have saved the ship, but they refer all to the mercy of God; not that they feel that they have contributed no skill or labour to save the ship, but because they know that while they contributed the labour, the safety of the vessel was ensured by God. So also in the race of our life we ourselves must expend labour, and bring diligence and zeal to bear; but it is from God that salvation is to be hoped for as the fruit of our labour. (First Principles, Book III:18)