this, a thousand times this. I am a person who loves learning. And learning new programming languages is always a nice experience, but we are all human beings with limited time in our hands. Learning a new language every month sounds like fun but how much time can you devote for that? How well will you learn it? Will it be worth the time spent? Will it spread your horizons enough or would that time have been better spent in actually keeping up with the developments in your language (field)?