It is important to note that four times, David calls God his “rock.” This not an ordinary rock. It is not a boulder. It is a jagged cliff. It is a rock that overhangs and forms caves. David must have been familiar with these types of rocks.
So, what is all the excitement about? Psalm 1 illustrates a contrast of the blessed man with the wicked man. Or, to make it easier to remember, it is a contrast between the righteous and the unrighteous.