They seemed to have trusted altogether to the old familiar instruments, praise and blame, reward and punishment.

Now, I did not doubt that by these means, begun early, and applied unremittingly, intense associations of pain and pleasure, especially of pain, might be created, and might produce desires and aversions capable of lasting undiminished to the end of life.

But there must always be something artificial and casual in associations thus produced.

The pains and pleasures thus forcibly associated with things, are not connected with them by any natural tie; and it is therefore, I thought, essential to the durability of these associations, that they should have become so intense and inveterate as to be practically indissoluble, before the habitual exercise of the power of analysis had commenced.

For I now saw, or thought I saw, what I had always before received with incredulity -- that the habit of analysis has a tendency to wear away the feelings: as indeed it has, when no other mental habit is cultivated, and the analysing spirit remains without its natural complements and correctives.