Shaykh Abul Hasan Ali Nadwi (may Allah have mercy on him) said,

‘In Prophetic tradition (hadith) supplication has been called مخ العبادة (soul of worship).

When Allah, Most High wants to bestow someone (with His special favors) He inspires in him the art of supplication (dua).

This supplication is from the depth of his heart and intellect. Moreover, it  seems to emanate from each and every cell of his body.

This supplication gives him the courage to face the hardships of this worldly life.

It instills in him new hope and aspiration.

It increases his trust in Allah.

And (most importantly) it stirs awake his determination to act appropriately.”

Muqadamah:Tasali ka saman, page 9