Helping someone who is dealing with issues such as depression, PTSD, bi-polar disorder, etc. can be quite rewarding. But you have to know your limits. For example, when you're trying to help those with mental health issues, you have to be educated enough to know that you're not educated enough to play therapist (unless you happen to be a therapist, that is). I'm not saying that you should never give advice to someone with mental illness. However, you must know your limits. Shrinks are trained to know what to say to a person struggling with serious issues. But you're not.