Tell that to those people suffering from anxiety, delusion, and other illnesses. Sometimes, you can't control fear because it's no longer a state of mind. It's what kind of DNAs you have accumulated since you were born. Some scientist said that water can store memories. I guess, from the past, when our ancestors were busy being slaughtered by predators, their memories (DNA) were washed away, evaporated in the air and being recycled to be poured down in a pregnant mother's cup, and maybe, the baby who gets it must be the chosen high-spirited one, or maybe the karma one. Thankfully, there are meds today that counters that.