Brahma hears the words,Thapa,thapa

In the beginning of the Kalpa,one day,Brahma wanted to find out the origin of the lotus,on which he was sitting.He searched in the waters surrounding him for a long time,but couldnot findanything.He came back again and sat in his seat,the lotus.He wanted to create the universe,but could not remember the procedure.He was sad.He became aloof.He became dull.During that time,he heard the words,Thapa,Thapa!from under the waters surrounding him.He wanted to find out the person who was uttering those words...penance ie thapa.He searched again but could not find anyone or anything.He came back and sat in Padmaasana ie lotus position and started to think.He understood that the words implied him to do penance.So,he started praanaayaama held his senses under control,concentrated his mind and soul without any wavering and did thapa for thousand celestial years.Universe became hot and unbearable.Then Srihari came and atood before Brahma.