Patanjali details the 7th limb of ashtang yoga,
तदेवार्थमात्रनिर्भासं स्वरूपशून्यमिव समाधिः॥३॥
Tadevaarthamaatranirbhaasam svarupashunyamiva samaadhih ॥03॥
Tad: that (practice of Dhyan)
Eva: the same
Artha: essence
Maatra: only
Nirbhaasam: shining forth
Svarupa: form
Shunyam: nothingness
Iva: like, as if
Samaadhih: samadhi
When there is awareness of just the object of Dhyan, and the Swaroop of chitta becomes like shunya, the Dhyan becomes Samadhi.
There is a merger with creation, but at levels. It is a constant endeavor. Never think that you have reached the finality, samadhi is not finality, because there still exists something beyond...there is no finality to infinity. That is why, ek tatva nirantar abhyas. Always remember, this is not it - there is something beyond, which you cannot see since you are limited, your Guru can...and he will always make you rise higher
