Is it possible, or even practical for someone to strengthen his or her 4th function?

I know that successful people rely on their strengths to become successful, and it would almost be pointless to focus energy on one’s weakness only to become average in that area. But lets say a person is fully aware and honest at all times, yes, this would require a great deal of energy, but is it really possible?

For those who have access to the Russian literature, this may sound really stupid, please forgive me.