It sometimes happens that there is repulsion between two people at first sight which later turns into a fast friendship; but it is not often so. Those who are to be friends are generally friends at first sight. In the former case there may be something which has a repellent influence, but after some time, when one has got over it and has become accustomed to it, one can bear it more easily; then one may find something interesting in the other person, and may even become friends. It is like becoming accustomed to poison.