In Gethsemane the holiest of all petitioners prayed three times that a certain cup might pass from Him. It did not. After that the idea that prayer is recommended to us as a sort of infallible gimmick may be dismissed.
Yes, there is a Nirvanah; it is in leading your sheep to a green pasture, and in putting your child to sleep, and in writing the last line of your poem.
Few people have ever seriously wished to be exclusively rational. The good life which most desire is a life warmed by passions and touched with that ceremonial grace which is impossible without some affectionate loyalty to traditional forms and ceremonies.