This is the first time I'm posting an informative forum post so I'm sorry if there is something you think is not quite right. I just got this information based on what I was taught and what I think of it.
Everything needs a balance. Just like there is a yin to a yang, there is black magick to white magick. Now, these colors are figurative. Magick has no color. The black and white magick symbolizes the kinds of spells and ritualsm.
There is no one who is all bad or all good. We all have some of both in us. Maybe more of good or bad for some but we have some of the other just the same.
Too much of something is bad even those that are good. For example, if you have too much Vitamin C, there is a higher risk of getting kidney stones. What I mean to say is, if you concentrate on only white magick and are not aware of black magick, then when the time comes that black magick is needed, you will not know what to do. The same goes for black magick.
I know that some people here have a strict policy to not practice black or white magick but all I'm saying is be aware of them. Maintain a balance.