'A moment of happiness' and 'a period of depression.' Words say it all.Simple words like 'A moment of happiness' and 'A period of depression' have such deep meaning that, when analysed, they portray the whole reality of life.
When you are happy or joyful, hours and days may pass by like a moment and when you are sad or depressed even a minute may feel like days. Our whole life is like this only, if we spend it happily it will feel as if, we had no time at all and if we remain sad the life may seem a burden that is never ending.
We can always experience this and it teaches us to remain happy no matter what the situation maybe. Being sad momentarily due to some loss is okay but to come out of it is very important to realise the true beauty of life.