Psalm 33:7, "He gathers the waters of the sea together as a heap. He lays up the deeps in storehouses," is a poetic expression of God's power and control over the natural world. Let's break it down:

"He gathers the waters of the sea together as a heap": This refers to God's ability to control the oceans. The image of gathering the water into a heap suggests immense power and organization. It contrasts the vastness and fluidity of the sea with a concentrated, manageable form. Some interpretations see this as a reference to the creation event in Genesis 1, where God separated the waters below from the waters above. The "heap" could also allude to the way God can control the tides, or even the way he miraculously parted the Red Sea for the Israelites.

"He lays up the deeps in storehouses": "Deeps" refers to the deepest parts of the ocean, and "storehouses" suggests containment and control. This imagery further emphasizes God's ability to govern the seemingly untamable forces of nature. It implies that the ocean depths are not chaotic and random, but are under God's purposeful management. Some scholars suggest this might also allude to underground reservoirs that feed springs and rivers, emphasizing God's provision of water sources.

Overall Meaning

The verse serves to:

Highlight God's Sovereignty: The primary message is that God is sovereign over all creation, even the most powerful and unpredictable elements like the oceans.
Emphasize God's Power: It showcases God's immense power and ability to control the forces of nature.
Inspire Awe and Trust: By contemplating God's control over the natural world, the Psalmist (and the reader) is encouraged to trust in God's power and provision.
Offer Comfort: Knowing that God is in control can be comforting, especially during times of uncertainty or fear.

In short, Psalm 33:7 is a vivid and poetic way of declaring God's absolute mastery over the natural world, inspiring awe, trust, and reverence.