There is a danger of becoming too preoccupied with concentration on self-improvement. A balance must be kept. To achieve this, he should also concentrate on the Self and the Non-Dual Impersonal Void-All. And he should do so joyously, happily. This is why the Short Path must balance the Long one.
-- Notebooks Category 23: Advanced Contemplation > Chapter 5: Balancing the Paths > # 192