Professor Ansarian:
Prayer is so heavy, it,s even heavier than the skies and the earth. Saying prayers is praising Allah Almighty, "Praise be to Allah Lord of the Worlds." And this remembrance is so significant which contains all other praises and gratitude. Imam Sadiq (as) says: My father Hazrat Baqir (AS) had a roadster that was lost, and people searched everywhere for it but they did not find it. People came to Hazrat Baqir (AS) and told him that they couldn,t find the his horse, it is better to forget about it. Hazrat Baqir (AS) vowed to have an oblation in case his roadster is found and that oblation was to do whatever praise in the world for Allah Almighty. After a while the roadster was found. We were all waiting to see how Hazrat Baqir (AS) is going to do all the praises that are in the whole universe. Is it even possible?
Imam Sadiq (as) says: My father put his right foot on the racetrack and, before putting his left foot in the next race, he said: "Alhamdullah." "Praise be to Allah Lord of the Worlds." Then he sat on the saddle. The companion said to him: you have promised to do whatever praise is in the universe for Allah, Hazrat Baqir (AS) said I did what I had promised. I said "Praise be to Allah Lord of the Worlds."
source : erfan.ir