Changed perspective

I've recently experienced a peculiar new understanding of psychotherapy and it's meaning to me changed. Just to give the reader a little bit of perspective, I like many of us, have been accustomed to speaking my mind in a manner that would suggest that what I had to say just made sense and could be useful to everyone without further adjustment. (Ha ha)
Recently, as my friendships and understanding of people expanded, I began to consider that my way of making sense of the universe differed widely from that of others. What could this mean? Would other people's perspectives make just as much sense as mine in this reality we cohabit? I guess so, because I've recently realized that my suggestions and ideas don't make sense or work for everyone. Big deal, right? It is to me (pun unintended) since this may mean that psychotherapy as I know it is not just an objective tool that can be beneficial for everyone. What will be the result of this expanded thinking I'm not sure, however I am humbled to a more realistic place for the time being.
By the way, check out this definition of psychotherapy I found online (google define):

Psychotherapy is a set of techniques intended to cure or improve psychological and behavioral problems in humans. The commonest form of psychotherapy is direct personal contact between therapist and patient, mainly in the form of talking. Because sensitive topics are often discussed during psychotherapy, therapists are expected, and usually legally bound, to respect patient privacy and client confidentiality.