Notwithstanding the apparent simplicity of the sloka 1.17 it has a fundamental value in scope of Patanjali’s concept of Yoga and in understanding the principles of spiritual advance in general. As for its application significance, this line probably comes as the second most important after the one defining Yoga as chitta-vritti-nirodhah.
In fact, in this line Patanjali points out the fact of contiguity of the spiritual dimension and the processes happening within it (I hope to talk about Samprajna as comprehension, the act of consciousness expansion, in one of the following articles) with cognitive processes (vitarka and vichara), emotional (ananda) and existential (asmita) experiences.
