I was listening to a real life story from the life of Guru Nanak Dev ji, the first Guru of the Sikhs. Guru Nanak Dev asked his disciple Mardana to purchase Truth and Lie for one Dhela i.e. for two paise.
Mardana went everywhere to purchase these things but was ridiculed by the people who stated whether at any place in this world, Truth and Lie are sold! Finally, Mardana went to the shop of a holy man who remembered death and took a piece of paper and tore it into two. On one piece he wrote that dying is Truth and on the other piece, he wrote that living is a Lie. He took the money from Mardana and gave him the two pieces of paper.
Mardana went back and delivered the papers to the Guru ji who was very happy on reading these papers and told Mardana that here is a really great man who has not forgotten death and he must be a very religious man.
Although many preachers recite this story to emphasize that we must remember death and recite the name of God, I know from personal experience that remembering death always create a sense of depression in a person and it is only a desire to get on with the life and do something in the life itself that is worth doing that creates real happiness.