What is it in you and me incomprehensible

What is it in you and me, incomprehensible

Kuch toa hai tujh main ke hum tujh ko qareeb pate hain
Kuch toa hai tujh main ke hum aapnay aap se door hona nahin chahte hain
Kuch toa hai tujh main ke hum tujh se haar baat paar ulajhte hain
Kuch toa hai tujh main ke hum aapnay ko purnaam karte hain
Kuch toa hai tujh main ke hum tujh ko sab se jeetna chahte hain
Kuch toa hai tujh main ke hum aapnay aap ko tujh main khona chahte hain
Kuch toa hai tujh main aur kuch toa hai hum main
Ke tum hum donoon ek doosray main fanah hona chahte hain