When a child is reared/raised on lies does it permanently cripple his/her ability to determine decipher discern decode decide?

Is it possible for such a child's crippled mind to be made whole again with the proper treatment or is that mind lost forever since a child learns early on and by age 6 he/she is the person he/she is going to be.

Cripple your child early on he/she will be hobbled an entire lifetime..