In Korean the syllable 씨, ssi — seed — does not go only with plants. 말씨 is how a person speaks. 마음씨 is how they are inside. 솜씨 is what their hands can do. 글씨 is their handwriting. Wherever the language wants to name what somebody is made of, it puts this one syllable on the end.
To say a person's malssi is fine is not a remark about their voice. It means that where there were several ways to say a thing, they picked the one that would not cut. If maeumssi is the grain of somebody, malssi is that grain showing on the surface. Which is why it cannot be put on from outside. The grain has to be good for the figure to be good.
There is a saying as well: words become seed. Whatever you let fall gets planted somewhere and comes up. Kind words bring up kind things and hard words bring up hard ones, and as with any seed you cannot tell at the time. You find out once it is grown.
I said something at lunch today that I would like back.