It is personal because each person has their own degree of assurance. Because assurance the Patriarchs had came before Moses' Torah, we know this kind of trust is not dependent on, or a product of obedience to the Law. It is something G-d does, for whatever is his purpose, and by his own initiative. Our daily activities need this faith, this assurance of G-d's presence and love . Jews obey not to get faith, but because faith requires obedience.
Obedience relates directly to the blessings and cursings.
Faith is given by G-d's grace, because of his love for us. Faith was given to the Patriarchs not because they had earned it, but because G-d chose to give it. Click here to see how much G-d loves you. Our religion is more than a religious system of the Law. It is different than the Law.