What is Prema- Bhakti?

Once I heard a beautifully articulated Sher (Verse) with a deep hidden meaning behind it.

                Tera wajood riwaazon kay aetqaaf may hai
                Mera wajood us kay Ain-Sheen-Qaaf may hai
                                         (Author -Unknown)

There is such a profound depth in this verse - a remarkable stunning deep meaning is hidden in this Sher.
The Shayer says: 

Your worship or devotion towards God is solely and strictly based on rituals, rules, and regulations created by others. There are some specific customs and practices associated with your love - where certain manners, rules, regulations, and discipline have to be followed.

But - in the second line - the poet quite elegantly says that 

My existence - my devotion is only in His Ain, Sheen, & Qaaf.

Ain, Sheen, & Qaaf are Arabic letters - also used in Persian and Urdu scripts.
If you write these three letters in the Roman/English script, it will be - I, Sh, and Q - respectively.
Writing these three letters together in a sequence makes the word - Ishq (love).
In other words, the poet says - 

the base of my being - my devotion is only your Ishq 

- loving you from the core of my heart - solely out of love.

The mind, which is immersed in God's love, does not see anything other than God. 

There is no binding of rules, disciplines, or customs in pure love.
Immersed in pure love, Meera forgot all about her status & position - her family background and the social customs and she danced in the streets with bells around her ankles - singing:
                 'Pag Ghungru baandh Meera Naachi Ray'

Sant Kabir Ji Maharaj also says the same:
            Jahaan Prem tahaan naim nahin, tahaan na budhi byohaar
            Prem magan jab man bhayaa tau kaun ginay tithi vaar

Meaning - Where there is love, there are no conditions, set rules, or disciplines - nor there is any intellectual mumbo-jumbo.
When the mind is immersed in love, then who will check the time, count the days, and wait for the special events?

Prema-Bhakti is purely the devotion out of love - and nothing else but pure love.
                                           'Rajan Sachdeva '