Q). What is natural state (Sahaja Samadhi) ?
Ramana Maharshi : The state in which the unbroken experience of existence-consciousness is attained by the still mind, alone is samadhi. That still mind which is adorned with the attainment of the limitless supreme Self, alone is the reality of God.
When the mind is in communion with the Self in darkness, it is called nidra [sleep], that is, the immersion of the mind in ignorance. Immersion in a conscious or wakeful state is called samadhi.
Samadhi is continuous inherence in the Self in a waking state. Nidra or sleep is also inherence in the Self but in an unconscious state. In sahaja samadhi the communion is continuous.
Question : May I have a clear idea of the difference between savikalpa and nirvikalpa?
Ramana Maharshi : Holding on to the supreme state is samadhi. When it is with effort due to mental disturbances, it is savikalpa. When these disturbances are absent, it is nirvikalpa. Remaining permanently in the primal state without effort is sahaja.