' Wisdom and solitude '...

Wisdom is attained in solitude.

Bowl of Saki, by Hazrat Inayat Khan
Commentary by Pir-o-Murshid Inayat Khan:

The one who lacks peace, with all his possessions, the property of this earth or quality of mind, is poor even with both. ... True wisdom is to be found in the peaceful, for peacefulness is the sign of wisdom. It is the peaceful one who is observant. It is peace that gives him the power to observe keenly. It is the peaceful one, therefore, who can conceive, for peace helps him to conceive. It is the peaceful who can contemplate; one who has no peace cannot contemplate properly. Therefore, all things pertaining to spiritual progress in life depend upon peace.

To attain peace, what one has to do is to seek that rhythm which is in the depth of our being. It is just like the sea: the surface of the sea is ever moving; the depth of the sea is still. And so it is with our life. If our life is thrown into the sea of activity, it is on the surface. We still live in the profound depths, in that peace. But the thing is to become conscious of that peace which can be found within ourselves. ... the first thing is to seek the kingdom of God within ourselves, in which there is our peace. As soon as we have found that, we have found our support, we have found our self. And in spite of all the activity and movement on the surface, we shall be able to keep that peace undisturbed if only we hold it fast by becoming conscious of it.

The bliss found in the solitude is hidden within every human being; he has inherited it from his heavenly Father. In mystical terms it is called the All-pervading Light.

How can one attain to the deeper side? ... One method is to acquire the knowledge from the life without, and that is going to school and attaining the knowledge in that way. Another method is quite different; it is not going to school or institution and study, but closing the door of one's room, sitting in solitude, closing the eyes, being oneself once again, and trying to put one's mind within, seeking the source within, getting the knowledge which be gotten only from within.