Be quiet

https://pixabay.com/photos/sunset-abu-dhabi-landscape-267187/

As you grow older

Be careful not to get involved in irrelevant matters.

In some cases, the words you say are inappropriate

I have a sore ear.

I came to understand that

It's the awareness that words should be kept to a minimum.

Everywhere with reason

To be restrained

It is important not to be in the wrong place.

Gives a quiet mouth coolness.

@aungtun