John 15:5 "I am the vine, you are the branches; he who abides in Me and I in him, he bears much fruit, for apart from Me you can do nothing.
This is what thornandnails means, that without Christ, you can do nothing. Without Christ, non-believers would cease to exist, because their every breath comes from Him.
So thornandnails was just saying, God get's the glory in all things.