When you are waiting in front of a theatre or at the train terminal, you will realize how important punctuality is. Punctuality is really a virtue, especially in a modern life. Perhaps if everybody was punctual, there would be less suffering and sorrow.
Punctuality is the main constituent of good character. A person who is on time for his appointment shows his real consideration for others. On the other hand, a person who is always late shows his selfishness and thoughtlessness and he is not the person that is worthy to be friends with.
To be or not to be punctual is a habit. So when we are young, we should try to be punctual every time and never be late, for it is much more easily acquired in youth than when we are older.