Counter-claims

I'm not sure where I got this idea from, but for a very long time, I thought about life in terms of either/or. Specifically, you can be smart or good, you can be nice or mean, you can be smart or stupid, you can be a good student or have a social life, et cetera. The first theory was disproved in sophmore year, when I began getting to know people like J and A, who are smart and good (I can assure you that my mind was blown). I guess I was wrong the whole time?