Hebrews 11: 1 - 2, 8 - 12
1 Now faith is the assurance of things hoped for, the conviction of things not seen.
2 For by it the men of old received divine approval.
8 By faith Abraham obeyed when he was called to go out to a place which he was to receive as an inheritance; and he went out, not knowing where he was to go.
9 By faith he sojourned in the land of promise, as in a foreign land, living in tents with Isaac and Jacob, heirs with him of the same promise.
10 For he looked forward to the city which has foundations, whose builder and maker is God.
11 By faith Sarah herself received power to conceive, even when she was past the age, since she considered him faithful who had promised.
12 Therefore from one man, and him as good as dead, were born descendants as many as the stars of heaven and as the innumerable grains of sand by the seashore.

EWTN