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To the writer, "Rain" here means the the temptations and trails we face in our every day activities. While in other hand, "Rainbow" intells the beautiful things in life that comes our way.
This show us that in life the most beautiful things come with their challenges.
To have those beautiful(rainbow) things in life, there will also be both the rain (trails) and Sun (temptations)
Rainbow is caused as a result of millions of tiny rain droplets. Making that little sacrifices brings out the beautiful outlook in life.
If there is no enough droplets in the atmosphere, the result of it will show in the rainbow. Therefore we we put little effort in what you do, it will show in the outcome.
Wake up from your slumber and put enough effort and energy to actualize your rainbow in life.