Why did Husserl try to set aside both philosophical theories and common-sense beliefs?

Edmund Husserl sought to set aside both traditional philosophical theories and common-sense beliefs to establish philosophy as a "rigorous science" free from unexamined presuppositions. He believed that existing epistemological theories, such as those from Descartes and Kant, wrongly assumed a gap between the knower and the known, which made knowledge of the external world appear dubious and in need of justification.123

To bypass these assumptions, Husserl employed a technique known as the epochē, or "bracketing". By suspending judgment regarding the existence of the world and setting aside everyday preconceptions, the philosopher can shift focus from a straightforward orientation toward objects to an orientation toward consciousness itself. This process allows for a "presuppositionless" investigation, enabling the researcher to grasp the essential structures of experience—the "things themselves"—as they are immediately given in consciousness. Ultimately, this method aimed to reveal how meaning is constituted and to provide a secure, absolute foundation for knowledge that avoids the pitfalls of naturalism, historicism, and speculative metaphysics.13425