Is it because faith comes from believing in Jesus?
Hebrews 4:1 - 16
NKJV - 1 Therefore, since a promise remains of entering His rest, let us fear lest any of you seem to have come short of it. 2 For indeed the gospel was preached to us as well as to them; but the word which they heard did not profit them, not being mixed with faith in those who heard it.
For follow-up discussion and general commentary on the topic. Comments are sorted chronologically.