I don't see this as a "don't toot your own horn" type quote. This seems to be saying that the more merit a thought, action or event holds, the less "noise" it makes. That just does not seem right to me.
I see it as just the opposite. An Idea or accomplishment of merit should be heralded far and wide so that it can reach to the far corners of the world. Not to bring praise or glory to the person, but to the thing of merit, finding a cure for a disease, a way to end world hunger, solving the need for clean and affordable energy. . . the person who discovered or created the solutions (things of merit) may not receive recognition or fanfare, but the thing of merit should be sent out into the world with a whole lot of NOISE!
This quote may make more sense in it's original context.