The first: Protecting the heart and the limbs from sins and all forbidden matters.
The second: Protecting the heart and limbs from disliked matters (makrooh).
The third: Protecting oneself from the fudool (curiosity) and what does not concern him.
The first gives the servant his life, the second gives him health and strength and the third enables him to gain happiness, contentment and light.
(ref: Haafith Ibn al-qayyim rahimahullah wrote in Al-Fawaa'id pp: 45)