We are also inclined to deprecate habits on the ground that the man in the grip of habit is hopelessly in the _*rut_, that the man who has reduced his work to habit ceases to be original and is incapable of further improvement. On the contrary, the grip of habit is but a support. The editor could not write his trenchant editorials, and the advertiser could not write his compelling copy, unless in the act of writing each could turn over to habit the manipulation of the pen, the formation of the letters, and the spelling of the words. The attorney cannot make his most logical arguments and the salesman cannot make the best presentation of his goods, unless they can depend upon habit for correct verbal expressions, unless their thoughts clothe themselves automatically in appropriate verbal forms. When we are in the grip of habit, if it be a good habit, we are not so much in a rut as on the steel rails where alone the greatest progress is
made possible. We are not enslaved by good habits, but rather might it be said that no man is truly free to advance and to make rapid progress till he has succeeded in establishing a mass of useful habits.
HOW HABITS ARE FORMED
Modern physiological psychology has dealt with the problem of explaining the possibility of the formation and maintenance of habits. The explanation is found in the mutual development of the mind and the nervous system and in the dependence of thought and action upon the nervous system, and particularly upon the brain. To understand habit we must look beyond thought and action and consider some of the fundamental characteristic features of the nervous system. One such characteristic is the plasticity of the nervous substance. If I bend a piece of paper and crease it, the crease will remain even after the paper is straightened out again. The paper is plastic, and plasticity means simply that the substance offers some resistance to adopting a
new form, but that when the new form is once impressed upon the substance it is retained. Some effort is required to overcome the plasticity of the paper and to form the crease, but when it is once formed the plasticity of the paper preserves the crease.
Modern conceptions of psychology have emphasized the intimate relationship existing between our thoughts and our brains. Every time we think, a slight change takes place in the delicate nerve-cells in some part of the brain. Every action among these cells leaves its indelible mark, or crease. Just as it is easy for the paper to bend where it has been creased before, it is likewise easy for action to take place in the brain where it has taken place before.
The brain may also be likened to the cylinder or disk used in a dictating machine and in phonographs, and a thought likened to the needle making the original record. It takes some energy to force the needle through the substance of the cylinder, but thereafter it moves along the opened groove with a mini-
mum of resistance. In a similar way it is easy to think the old thought or to perform the old act, but it is most difficult to be original in thinking and in acting. When an idea has been thought or an act performed many times, the crease or groove becomes so well established that thinking or acting along that crease or groove is easier than other thoughts or actions, and so this easier one may be said to have become habitual. In a very real sense the thoughts and actions form the brain by means of the delicate physical changes which they produce; and then, when the brain is formed, its plasticity is so great that it determines our future thinking and acting.
HABIT SHORTENS THE TIME NECESSARY FOR A THOUGHT OR AN ACT
Human efficiency depends in part upon the rapidity with which we are able to accomplish our tasks. It is surprising to us all when we find how rapidly we can accomplish our habitual acts and how slowly we perform the tasks to which we are compelled to give specific atten-
tion.