Baba says - One should die not to take birth again and take birth not to die again.
Why a person has to take birth again after death?
The only reason is that the person has failed to take the opportunity of the current birth to wash away his previous bad 'karmas' by doing good deeds. Instead he has chosen to indulge in greed which is mother of all sins. Greed leads to Desire. Desire leads to Sankalp. Sankalp leads to Action. Action is recorded as a Karma in the Chitha which is gupt (latent) in the body and hence the cycle.
In simple words, one should do so much good 'karmas' in this life so that after death he does not have to take birth again. Or having taken birth, one must lead his life in such a manner that he dies only once and breaks away from the cycle of life and death.