"Keep a diary, and someday it'll keep you".
                                                                                           -Mae West
  
Diary can be considered to be as a very trusty friend for which we can be open in all the ways.Many great leaders have the habit of writing a diary.I do not insist to write lengthy pages what you have done since morning up to the sleep.Just make a short note of the good or bad you have grasped or learned from that day.It also gives you a good remembrance of enjoyment that you have made at that time.The bad you have done that day must be accounted in it to rectify that and try to find a method of rectifying it so that you can build up your character.

Of-course, I too have started this habit recently.My father gave me a diary just on the x-mas evening and suggested me to start writing diary.He gave it to make improve my language.I will certainly respect him.
Anyways i just want to suggest you to make this as a habit and you will feel the difference.

Any new changes which are meant to be good show their effect very slowly.So just be patient enough in your efforts.

I will be happy for any positive response.....