My efforts to understand the relationship between samsaric mind and thoughts led me to an image of a calm lake. A stone [a thought] is thrown into the water, causing ripples [samsaric mind]. The mind appears due to the thought, which can start a chain reaction of further thoughts and/or emotions. But as the ripples are a manifestation of the lake, the mind is perhaps a part of something bigger. So ... I think the origin of samsaric mind is more fundamental than thoughts while its existence co-depends on thoughts.
I have also been thinking over some of my dreams where there is an awareness, "Oh, this is a dream." They have shown me how the dreaming mind and thoughts are co-dependent. But what this awareness is and relationship between the mind and the awareness are still something of a mystery to me.