The Hebrew term used by David and translated "confident" does not mean self-reliant nor brave, humanly speaking.
In Hebrew it means "to trust, to be secure, to have assurance."
Its Arabic counterpart is picturesque: "to throw oneself down upon one's face, to lie upon the ground."
The point here is that the source of David's confidence and stability was not his own strength—but God. His Lord was his only foundation for rock-like stability.
What an unshakable foundation!
When pressure mounts, when a groundswell of fear invites panic, to whom do you turn?
Excerpted from Charles R. Swindoll, Wisdom for the Way (Nashville: J. Countryman, a division of Thomas Nelson, Inc., 2001). Copyright © 2001 by Charles R. Swindoll, Inc. All rights reserved. Used by permission.