Faith

Hebrews 4:2
For good news came to us just as to them; but the message which they heard did not benefit them, because it did not meet with faith in the hearers.

Homily:
The good news is not exclusive to any select group of people. 
Salvation is not exclusive.
God's love, mercy, and grace are not exclusive.

All righteousness available to the saints are available to us. Our faith is the distinguishing factor.

Why do we need faith?
Hebrews 11:6
And without faith it is impossible to please God, because anyone who comes to him must believe that he exists and that he rewards those who earnestly seek him.

How is it expressed?
James 2:17-19
In the same way, faith by itself, if it is not accompanied by action, is dead. But someone will say, “You have faith; I have deeds.” Show me your faith without deeds, and I will show you my faith by my deeds. You believe that there is one God. Good! Even the demons believe that—and shudder.

What is faith?
Hebrews 11:1
Now faith is confidence in what we hope for and assurance about what we do not see.