overcome the ocean of birth and death

Why is faith in the Lord necessary to overcome the ocean of birth and death?

Look at Arjuna! When the choice was placed before him to decide which he should receive – the entire army of redoubtable Yadhava war heroes or Lord Krishna alone, unarmed and refusing to fight – without any hesitation, he chose Krishna alone! He knew; he believed; and so, he was saved. What profit will an individual or country make if it accumulates money, gold and grain? The bliss derived from the worship of the Lord which arouses spiritual joy is, any day, far more desirable than the above. Want of faith is a source of true weakness. Love (Prema) is the seed, the overpowering experience of merging with the Divine is the tree (thanmayathwam), and inexhaustible bliss (Anandam) is the fruit. Achieve this consummation with firm faith in the Divine.