“Faith is the realization of what is hoped for and evidence of things not seen.” (Hebrews 11:1)
Faith is the theological virtue by which we believe in God, all that He has said and revealed to us and the Holy Church proposes to us, because God is truth itself. The article Faith explains this theological virtue.
“By faith Abraham obeyed when he was called to go out to a place that he was to receive as an inheritance; he went out, not knowing where he was to go.
By faith he received power to generate, even though he was past the normal age—and Sarah herself was sterile—for he thought that the one who had made the promise was trustworthy.” (Hebrews 11: 8, 11)
The article alludes to the faith of Abraham and Sarah, and the author of The Letter to the Hebrews presents other believers of the Old Testament including Moses, his parents and the prophets.
“All these died in faith. They did not receive what had been promised but saw it and greeted it from afar and acknowledged themselves to be strangers and aliens on earth.
But now they desire a better homeland, a heavenly one. Therefore, God is not ashamed to be called their God, for he has prepared a city for them.” (Hebrews 11: 13, 16)
Understanding places the previous biblical quotations in the right perspective. We are earth aliens and Heaven is our homeland. Therefore, we should live in the state of grace and long for God.