Tadevarthamatranirbhasam svarupashunyamiva samadhih
When the non-wavering and non-varying singular focal attention flows, shining brilliantly, then the feeling of 'I' fades out. When the feeling of the “I” fades out, absorption is felt. This is samadhi – when the focus of attention gets saturated and enhanced, timewise it transforms itself into meditation. Similarly, if the same focus of attention is prolonged timewise, lengthwise, and widthwise, it transforms in to absolute absorption or samadhi.