Spiritual attainment, from beginning to end, is unlearning what one has learnt. But how does one unlearn? What one has learnt is in oneself. One can do it by becoming wiser. The more wise one becomes, the more one is able to contradict one's own ideas. The less wisdom one has, the more one holds to one's own ideas. In the wisest person there is willingness to submit to others. And the most foolish person is always ready to stand firm to support his own ideas. The reason is that the wise person can easily give up his thought; the foolish holds on to it. That is why he does not become wise because he sticks to his own ideas; that is why he does not progress.