The idea you carry close to your bosom is famous to your bosom. (8-9)
Things are famous to what they are near; at least, that's what Nye's telling us. What matters to us is what has an impact on us. To have an impact, it must be close enough to reach us. Right? So, this idea is important to the bosom because it is so close to the bosom. Does it matter what the idea is, though? Would any idea have been famous to this bosom, if they were so close together?