No one tells me I can't do something.
Wouldn't have gotten my bachelors, my M.D., made a larger starting salary than my father's current salary, gotten married and paid off the wedding and ring, landed a career-launching position, became financially independent before the age of 20, went from an overweight 5'7" and 215 lb. to a lean 5'7" and 125 lb., bulked up from 125 lb. to 150 lb., became an experienced martial artist, traveled internationally, adventured briefly on international medical missions, earned a SCUBA license, or started learning Parkour if I listened to the people who said, "You can't."
My wife already knows that I ever get diagnosed with something terminal, I'm going to take up BASE jumping, skydiving, or something else ridiculously dangerous and die feet first with adrenaline rushing through my veins.
They say better to try than never know.
I say better to try and succeed.
Also, I re-post this video, because this guy is a fuckin' paraplegic, grade-A badass:
Note that 15 seconds in, he gets guard. Without any legs.
Its hard enough for me to get guard with two legs, I can't imagine what its like with none.
Watching this guy work is art in motion.
That guy certainly didn't buy into people saying he couldn't do anything. He just gets guard on them and beats them with the stick he mounted into his wheelchair.
Incidentally, Krav Maga is a lot of fun. Been doing it for a while myself. Its like taking 20+ years of other martial arts disciplines and condensing it down to a rapid-learning variant for people who just want to the learn the self-defense part of martial arts.