The book refers to the series of experiences that practitioners of the Subud 'latihan' (exercise) may go through in the process of training their inner feeling in practical life. It describes how one can feel the various influences of the forces that accompany human beings in this world, i.e. material, vegetable, animal and "ordinary human" forces. The book discusses how, through awareness of their influences upon the inner feeling, it is possible to integrate and be in harmony with these forces, which were provided to humanity for living in this world, and to be no longer dominated by them, through the support of the Great Life Force.