The world is so unhappy because it is ignorant of the true Self. Man's real nature is happiness. Happiness is inborn in the true Self. Man's search f… - Ramana Maharshi

If other thoughts rise, one should, without attempting to complete them, enquire, 'To whom did they arise?', it will be known 'To me'. If one then enquires 'Who am I?', the mind (power of attention) will turn back to its source. By repeatedly practising thus, the power of the mind to abide in its source increases.

21. During that time, the embodied person does not know the attainment in the heart. It is known in the Samadhi. The difference in name is due to the difference in cause.

Existence of Isvara follows our conception of Isvara. Let us first know whose concept He is. The concept will be only according to the one who conceives. Find out who you are and the other problem will solve itself.