All my turmoil and instability depended on your support, just as the waves of the sea only surge upon the sea itself.

This beautiful couplet talks about how deeply connected one's life is to someone else's support. It says that all the chaos and struggles in the speaker's life were entirely dependent on this support, just like the waves of the sea. Think about it: waves might crash and roar, they might seem wild and independent, but they are always part of the ocean. They rise and fall only within the sea itself, never truly separating from it. Similarly, the speaker's ups and downs, their entire journey, finds its ground and meaning solely through the support of that special person or entity. It's a powerful statement of profound reliance and interconnectedness.