You must not only think thoughts, but do actions. The reality of man is their thoughts and their spirits, not their material bodies. Man and animal with regard to matter are partners. The difference is that man has the power of thought.
Thoughts may be divided into two classes:
1. The world of thought alone.
2. The world of thought which expresses itself in action.
For instance, philosophers belong to the first class, for they only think heavenly thoughts and do not do heavenly deeds. Whereas spiritual teachers belong to the second class, for they express their high and noble thoughts in actions as soon they think them.
(From a talk given by ‘Abdu’l-Baha in Paris, France, October 18, 1911; Star of the West, vol. II, no. 6)