What are the requirements of a good professional?

For one to be identified as a good and effective Professional he should have atleast the following:

    (A) is able to distinguish right from wrong;

    (B) is able to think and act rationally;

    (C) is able to keep promises and honor obligations;

    (D) is accountable for his or her own behavior;

Apart from the above, there will be other factors which will define a good professional.