Wisdom is attained in solitude.

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.