I think there needs to be a balance between nature and nurture when it comes to the behaviors or disorders we develop. I have personal experience with this regarding depression. I have an older brother, he is only 16 months older than me, so we developed, grew and learned generally at the same time. We grew up in the same environment, went through the same hardships and had fun times with our family. As adults we are both successful in post-secondary school; we also both have the same direct and determined attitude when it comes to achieving our goals. However, despite how similar we are, my brother was recently diagnosed with manic depression and paranoid psychosis. Despite our identical environment and genetic similarities, only one of us developed a mental illness. If only nature or nurture were responsible for the characteristics or disorders we develop; according to that school of thought I too would have lived with something similar to my brother. This difference reinforces my view that all behaviors and disorders are the result of a spectrum of variability between the influences of our genetic susceptibility and our environmental conditions.