The mind loves to find something to do. It craves something to do.
The mind is naturally unsettled. It is constantly movin' and a shakin'.
When you sit, you notice just how unsettled your mind really is. The mind resists, it tries to do anything it can to get away, to continue churning and doing and feeling like it is accomplishing something.
This is why meditation is difficult. We see directly just how dissatisfied and discontent we really are. We see with our own eyes how unsettled and restless we are.
How do you resist?
You maintain your discipline with mindfulness and vigilance.