Is this grammatically correct? What does it mean and can it be rephrased? “I’ve always said this”

Yes, "I've always said this" is grammatically correct. It means that the speaker has consistently expressed a particular opinion or statement over time. You can rephrase it in several ways, such as: - "I have always maintained this." - "This is something I've consistently said." - "I’ve repeatedly expressed this." - "I have always believed this."