Of all the thoughts that rise in the mind, the thought 'I' is the first thought. - Ramana Maharshi

Ishta-devata and Guru are aids - very powerful aids on this path. But an aid to be effective requires your effort also. Your effort is a sine qua non. It is you who should see the sun. Can spectacles and the sun see for you? You yourself have to see your true nature. Not much aid is required for doing it!

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.

Peace is for the purification of one's mind. Power is for the growth of the community. Having established the community with power, one should then establish supreme peace.