8 Faith opens the way before us and accompanies our steps through time. Hence, if we want to understand what faith is, we need to follow the route it has taken, the path trodden by believers, as witnessed first in the Old Testament. Here a unique place belongs to Abraham, our father in faith. Something disturbing takes place in his life: God speaks to him; he reveals himself as a God who speaks and calls his name. Faith is linked to hearing. Abraham does not see God, but hears his voice. Faith thus takes on a personal aspect. God is not the god of a particular place, or a deity linked to specific sacred time, but the God of a person, the God of Abraham, Isaac and Jacob, capable of interacting with man and establishing a covenant with him. Faith is our response to a word which engages us personally, to a "Thou" who calls us by name.
Source: Lumen Fidei (Vatican.va)