"I guess" is a casual phrase showing uncertainty, modesty, or tentative agreement. It can soften opinions, admit limited knowledge, or signal reluctant consent.
If your happiness depends on what somebody else does, I guess you do have a problem. Richard Bach
I believe a strong woman may be stronger than a man, particularly if she happens to have love in her heart. I guess a loving woman is indestructible. John Steinbeck
I guess a small-town mayor is sort of like a community organizer, except that you have actual responsibilities. Sarah Palin
I have too many fantasies to be a housewife.... I guess I am a fantasy. Marilyn Monroe
Democracy don't rule the world, You'd better get that in your head; This world is ruled by violence, But I guess that's better left unsaid. Bob Dylan
I guess I'm pretty much of a lone wolf. I don't say I don't like people at all, but, to tell you the truth, I only like it then if I have a chance to look deep into their hearts and their minds. Bela Lugosi