Great questions. I could refer you to many studies, lots of research papers, brain scans and professional opinions. Unfortunately I doubt if many people would read even one link I might link to for these scientific resources.
On the other hand I could just suggest you ask a married person.
Can someone really say just a few words and change your attitude, your behavior and even your outlook on life? Can another person affect your emotions, your future and your beliefs?
I think anyone that is married would say yes. Most definitely!
Probably anyone that has a mother too.