What does Psalm 65:6 mean?

"Special revelation," such as inspired Scripture (2 Timothy 3:16) or miracles (Psalm 65:5) are means the Lord uses to teach mankind about His character. "Natural revelation," or "general revelation," is the way in which God demonstrates His existence to all people (Romans 1:18–20; Psalm 19:1), on a wide scale. Here, David points to some of the Lord's incredible creations in nature as evidence of His power. Mountains are a common symbol of strength, stability, permanence, and power. To be "girded" in something is to be dressed in it, or to equip it.

Psalm 148 calls upon all creation to praise the Lord. Included in this crescendo of praise are mountains and all the hills (Psalm 148:9). As people gaze on the mountains, they are rightly impressed with their firmness and towering strength. Yet mankind ought to look beyond the mountains to the God who created them. The writer of Psalm 121 looks towards mountains—a place where one might build a fortress or stage reinforcements in battle—but doesn't stop there when looking for his ultimate help (Psalm 121:1). Rather, he trusts in the One powerful enough to make those very mountains (Psalm 121:2). Believers ought to be inspired by knowing that strong mountains were formed by an even stronger Creator. He is powerful enough to lift a believer's burdens, enable us to perform His will, and escort us safely to heaven (Psalm 18:32; Philippians 1:6; Hebrews 13:20–21).