Towards the end of the Ghaznawi Empire Hakeem Sinai (RA.) wrote a book, "Hadeqah" which was the first book written on tasawwuf in a poetic form. After that Hazrat Fariduddin Attar (RA.) wrote many Mathnavis among which the most famous one was "Mantiquttayr".
One day while Maulana Rumi (R.A.) was in a special state of ecstasy, he involuntarily uttered the first lines from the Mathnavi. Husamuddin Chalpi (RA.) heard it and insisted that Maulana should continue with it and complete the Mathnavi. The result was that six volumes were written.
During the period of writing there were many lapses of time. Hence we find quite a few couplets which were written wherein Husamuddin Chalpi (R.A.) was the cause for it being written. In some volumes Maulana had given a very good reason for the delay in writing, as for example:
"For quite some time, this Mathnavi has been delayed
It takes time for blood to become milk.
Until you are not blessed with another baby
The blood (in the body of the mother) would not transform into sweet milk."