Which is the best day to pray?

“One day, a young boy asked an old man: “Sir, which is the best day to pray?”

The wise old man replied: “My son, the best day to pray is the day before you die”.

The boy was astonished and replied: “Sir, how can I know the day of my death?”

And the old man answered: “No one knows the day of his death, that’s why we need to pray everyday.”