Like a trained surgeon who is careful where he cuts, parents, too, need to become skilled in the use of words. Because words are like knives. They can inflict, if not physical, many painful emotional wounds.

Haim Ginott (1922-1973) Israeli-American school teacher, child psychologist, psychotherapist [b. Haim Ginzburg]

Between Parent and Child, Introduction (2003 ed.) [with A. Ginott and H. W. Goddard]
    (Source)