Even in intake, the one steadfast thought is said to be the natural state. Nirvikalpa Samadhi will result when the sensory objects are not present.

He who thinks he is the doer is also the sufferer.

When one makes the mind stick to one thought, the mind becomes rock-steady and the energy is conserved.

Concentration of the mind is in a way common to both Knowledge and Yoga. Yoga aims at union of the individual with the universal, the Reality. This Reality cannot be new. It must exist even now, and it does exist.

If you hold this feeling of ‘I’ long enough and strongly enough, the false ‘I’ will vanish leaving only the unbroken awareness of the real, immanent ‘I’, consciousness itself

There is nothing so simple as being the Self. It requires no effort, no aid. One has to leave off the wrong identity and be in his (her) eternal, natural, inherent state.

You need not aspire for or get any new state. Get rid of your present thoughts, that is all.