The concept of a better tomorrow is ingrained in human nature. Every day man witnesses the fact that day follows night. And will always follow night. The same is true of life. In human life there is no full-stop. There are only commas until it reaches the final destination.
The concept of tomorrow is only relevant for human beings, not for animals. Humans always think by taking the future into consideration. No setback can take away this tomorrow-oriented concept. It is because of this concept that the struggles of human life are never given up as being futile. Just as the night cannot prevent the day from following it, no untoward circumstances can ever deprive man of the hope of a better tomorrow.
This tomorrow-based concept begins from individual life, covers national struggle, then goes on to the global hope of building a civilization. It is this continuity of hope which is man’s most distinctive feature.
It is generally held that death puts a stop to this continuity. But, the reason to believe in the eternal continuity of life is: if this process continues up to death, then why not after death? Death only comes to the physical dimension of the human personality. The other dimension, that is, the mind, is an eternal phenomenon. It is quite certain that the mind-based personality continues to exist even after the apparent death of the physical aspect of human life.
Source: Leading A Spiritual Life