His failures can always be traced back to his prayerlessness. It was his reckless independence rather than his humble dependence that tripped him up. Success, even when comes from God, brings with it great dangers. There's a tendency within each of us to begin to think that God blessed us, but that it's really our victory rather than His. Many men and women of God have fallen into this subtle trap.
Pride is at the root of the snare, and it always leads to defeat.
Many have risen to great heights only to fall a long, long way to the bottom. Pride always precedes a fall. There's one great conclusion that anyone must come to as he studies the life of David. We must walk humbly with God everyday. We can't ride on yesterday's victories.