Why does the length of Representatives' terms make them behave differently than Senators?

The Framers of the Constitution wanted the House to be
"nearer" to the people and for the Senate to be "farther" from the people.  They wanted
the House to really closely follow what the people wanted while the Senate acted like a
brake on what the people wanted.  This is why they have different lengths of
term.

The 2 year term for the House is meant to ensure that
they Representatives will always represent the will of the people (because they are
elected frequently).  The Senators' 6 year terms were meant to ensure that they would be
more detached from what the people wanted.

So the longer
terms for Senators are meant to make them behave less as the people want and the shorter
terms for Representatives are meant to make them behave more as the people
want.