Devotional service to the Lord is rendered by all limbs or parts of the body. It is the transcendental dynamic force of the spirit soul; therefore a devotee is engaged one hundred percent in the service of the Lord. One can engage in devotional service when the senses of the body are purified in relation with the Lord, and one can render service to the Lord with the help of all the senses. As such, the senses and the action of the senses are to be considered impure or materialistic as long as they are employed only in sense gratification. The purified senses are engaged not in sense gratification but in the service of the Lord in toto. The Lord is the Supreme with all senses, and the servitor, who is part and parcel of the Lord, also has the same senses. Service to the Lord is the completely purified use of the senses, as described in the Bhagavad-gita. The Lord imparted instructions with full senses, and Arjuna received them with full senses, and thus there was a perfect exchange of sensible and logical understanding between the master and the disciple. Spiritual understanding is nothing like an electrical charge from the master to the disciple, as foolishly claimed by some propaganda-mongers. Everything is full of sense and logic, and the exchange of views between the master and disciple is possible only when the reception is submissive and real. In the Caitanya-caritamrta it is said that one should receive the teaching of Lord Caitanya with intellect and full senses so that one can logically understand the great mission.