Legislative Branch - Why did the framers give stricter qualifications and a longer term of office for Senate? What was the reason to give the House members such a short term in office?

In deciding to create a bicameral Congress to replace that moribund institution, the Constitution's framers recognized that the Senate, chosen by state legislatures, would be a smaller body than the popularly elected House. To avoid being unduly threatened by public opinion, or overwhelmed by the House's larger membership, senators would need the protection of longer terms.