Stability refers to how an aircraft responds to changes in angle of attack, slip or bank. Control refers to the ability to initiate and sustain changes in angle of attack, slip or bank. In other words stability and control are very much opposites. 

An aircraft without sufficient stability will be difficult, possibly even dangerous to fly. On the other hand if the aircraft is so stable that it cannot be controlled that will also be dangerous.

Control

The first topic in this chapter is control. We will learn how the primary flight controls are used to initiate and sustain motions in pitch, roll and yaw.

Stability Definition

Next we must define and identify static and dynamic stability.

Directional Stability

Directional stability is what allows us to fly between two different points.

Lateral Stability

Lateral stability is 50% of what allows us to fly straight and level

Longitudinal Stability

Longitudinal stability is the other 50% of what allows us to fly straight and level.
It is controlled by the following

1. Main Wing
2. Stabilizer
3. Center of Gravity
4. Airspeed and Trim