Cognitive meditaion

Pathanjali's Yoga Sutras, Chapter 1: Samadhi Pada.
Sutra 17: Vitarka vichara ananda asmita anugamat samprajnatah

The cognitive meditation or realization of the Self
is accompanied by logical reasoning, deep a-rational inquiry, an experience
of bliss and the sense of 'I am'. Even at those times, there is
consciousness of the subject-object relationship and knowledge of the
physiological and psychological states, experiences and deeds. This is
called Samprajnatha Samadhi.

Sutra 18: Virama pratyaya abhyasa purvah samskara sesonyah

There is another meditation different from the previous one
is, the practice that is based on cessation of all effort even at
meditating. This practice leads spontaneously to tranquility. This is the
practice of mental suspension until only subtle impressions or memories such
as 'me' remains. Here 'me' impressions in the sense, body consciousness
remains.

Sutra 19: Bhava prathyayo videha prakrtilayanam

When such impressions remain, one retains
the possibility (and the cause ) of birth again, even after being freed from
the present body and after merged in unitive consciousness or becoming
integrated with one's own or the cosmic nature. For them, such impressions
or memories nurture and continue the awareness of continued
personal existence.

Sir,
I could not make up the meaning of these sutras. Please explain me.