Vimalakīrti says:

Oh, bodhisattvas, you should develop empathy for all living beings, for suffering is experienced from beginningless time, and, through your actions, work for the welfare of living beings.  

Manifest the roots of virtue, maintain the primal purity of mind, and practise a lack of craving. 

Strive to become the king of healers, one who works to cure all sicknesses.

Sickness arises from involvement in the process of misunderstanding from beginningless time — it arises from the passions that result from unreal mental constructions.

What is the elimination of this sickness? 

It is the elimination of egoism and possessiveness. 

What is the elimination of egoism and possessiveness? 

It is the freedom from dualism. 

What is freedom from dualism? 

It is the absence of involvement with either the external or the internal. 

What is absence of involvement with either external or internal? 

It is non-deviation, non-fluctuation, and non-distraction from equanimity. 

What is equanimity? 

It is the equality of everything from self to liberation. 

Why? 

Because both self and liberation are void. 

How can both be void?

As verbal designations, they both are void and neither of them is established in reality. 

Therefore, one who sees such equality makes no difference between sickness and voidness.  His sickness is itself voidness, and that sickness as voidness, is itself void.