Book-keepers who can name every folio page and every customer's balance are good for little else.
There is nothing in mental gymnastics from the dollar standpoint.
The good lawyer or the good business man does not rely on his memory, but rather his ability to find out things and get at results.
If you remember only the customers who are slow pay or shaky, it will be a lot easier than to remember the names of all the customers who pay promptly.
If your wife wants you to get something down town tomorrow, write her request on a little piece of paper, roll it up in a ball, put it in your pocket with your loose change. Forget the incident, let the paper do the memory act.
Next day when you reach in your pocket for change you will find the little ball with the reminder on it.
If there is something you want to attend to at home, drop yourself a postal card.
Carry a little pad of paper in your pocket. Write down the little things you are to do. Don't store your mind with these temporary matters. Let the tab remember for you.
Let your mind be like a sieve, and have the meshes coarse enough to keep in the big things and let the little things go through.
Have your business figures written down, your comparative sales, increases or losses. Study the written figures. Have system. Do things methodically. Don't trust to your memory. If the thing you see or hear is worth keeping, write it down on the little tab.