In this contest, "Rain" here symbolizes pain or trials that comes our way while 'rainbow' in itself, stands for something that is beautiful.
Putting these together, this proverb in-tells us that sometimes the most beautiful things in life always come with challenges.
just like there is no rose without thorns, no maturity without many trial. So, if we want a product we must then be willing to endure all the process.
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As such, to have rainbow one need both the rain and Sun, representing and standing in for trials and temptations.
Do you know that the Rainbow is caused by millions of tiny rain droplets. Therefore, it's just that little sacrifices we make that comes together in one accord to give us a beautiful outlook.
If there exist only a few droplets of rain in the atmosphere, It will inturn produce only few colors. Showing that the fewer the sacrifices the less glorious the victory will be.
Don't just take your sacrifices for granted, no matter how little they are. Each of the rain droplet plays a role and a part in the formation of the rainbow.
In whatsoever you do, if you want to come out flying high, just be willing to endure trials and tribulations that it throw in your way.
Be embracing!
Country's Proverb: unknown.