The habit of giving up when the present task is half finished and try something else is one of the chief causes of failure. - Christian D. Larson

You may think that you are well, but you will not secure health until you think thoughts that produce health. You may persistently affirm that you are well, but so long as you live in discord, confusion, worry, fear and other wrong states of mind, you will be sick; that is, you will be as you think and not what you think you are. You may state health in your thought, but if you give worry, fear and discord to that thought, your thinking will produce discord. It is not what we state in our thoughts, but what we give to our thoughts that determine results.

Promise yourself to forget the mistakes of the past and press on to the greater achievements of the future. To wear a cheerful countenance at all times
and give every living creature you meet a smile.

No effort should be made to destroy those habits or qualities that we may not desire. Whatever we think about deeply or intensely, the subconscious will take up and develop further. Therefore, if we think about our failings, shortcomings or bad habits, the subconscious will take them up and give them more life and activity than they ever had before. If there is anything in our nature therefore that we wish to change, we should simply proceed to build up what we want and forget completely what we wish to eliminate. When the good develops the bad disappears. When the greater is built up, the lesser will either be removed or completely transformed and combined with the greater.