Full Life is a Correct Combination of Instinct, Mind and Spirit

Instinct, mind and spirit are all essential to a full life; each has its own excellence and its own corruption. Each can attain a spurituous excellence at the expense of the others; each has a tendency to encroach upon the others; but in the life which is to be sought all three will be developed in coordination, and intimately blended in a single harmonious whole.

Bertrand Russell, in 'Principles of Social Reconstrution'