A statement in which the subject is not a specific person or thing is said to lack a referential index.
So instead of mentioning a specific name you might say 'all', 'people', 'it', 'one' or 'they'.
This makes the statement more general and leaves the listener in the position where they can apply it to themselves. It can also add authority to a statement by suggesting it is a generally accepted statement.
"You can notice a certain sensation."
'People can understand."
'One can relax more easily if.'