it says... new ideas are mostly worthless, and most try to pass them to another sucker.
The quote is suggesting that new ideas are often perceived as being undesirable, just like bad sixpence coins. It implies that people continuously try to convince and persuade each other to accept and adopt these new ideas, even though they have little value or significance. In other words, the quote suggests that there is a constant cycle of promoting and advocating for new ideas, despite their lack of worth or effectiveness.
