What do diseases tell us?
First of all, diseases show us our failings. They can even be ruthless in this respect. Nothing in this life is meaningless, without a purpose or unnecessary. The amount of suffering sent is precisely what we can endure.
Mankind needs to get rid of pipe dreams and vain hopes like avoiding diseases or wiping them from the face of the earth. If mankind gets vain and starts drifting away from unity, diseases push it toward desperation and force it to be modest. Man can only realize that these illnesses are friends and allies once it recognizes that diseases and death are humanity’s real fellow travelers.
The meaning we ascribe to life causes consciousness to appear. If one is negligent, it means that person is now conscious; not aware; that they don’t know themselves. If our aim is to know, naturally we have to avoid being negligent.