The late composer-conductor Leonard Bernstein said to an interviewer, "I believe in everything, in anything that anybody believes in, because I believe in people. In other words, I believe in belief. I believe in faith." (Maestro: Encounters With Conductors of Today, by Helena Matheopoulos, Harper & Row, 1982, 7)
But "faith" in faith is not to be mistaken as faith in God. Real faith is placed in God's Word and always responds in obedience to God's correction or direction. Abraham and Sarah are examples of this real faith. They left the security of their homeland and followed without knowing where God was going to lead them. All they knew was that God had given them promises. Each step they took was literally a step of faith.
"By faith Abraham… obeyed" (Hebrews 11:8). "The pith, the essence of faith," said Charles Spurgeon, "lies in this: a casting oneself on the promises." (from The Bible Exposition Commentary: Old Testament ©2001-2004 by Warren W. Wiersbe)