Gita series 37. Bhagavad Gita - Chapter III. 7-8:

“But the one who controls his senses through the mind and follows the path of karma yoga without any attachments is considered as great. Perform the mandatory actions, as performing actions is better than inactivity. Further, inactivity does not even help to nourish your physical body”. Krishna further explains karma yoga. As discussed in earlier verses, Krishna says that the senses should be controlled by mind and not by the external factors. A man functions on two types of forces called internal tools and external tools. Internal tools are known as anthakkaranam that include mind, intellect, consciousness and ego. The senses can be controlled permanently by using the internal tools. On the other hand, if senses are curbed by exercising control on objects, then control becomes impermanent. Intellect, consciousness and ego are the products of mind only and hence mind is considered as the epicenter of all bodily processes. If this epicenter becomes repeatedly impaired with external sensory objects, it could lead to a human volcano as the potency of the mind is extremely cogent. The human mind is so made that it is easily afflicted by senses and safeguarding the mind from the sensory influence is very difficult. If mind is made to be controlled easily, probably the karma may not have an active contribution in human behavior. Controlling the mind is called penance, which can be effectively achieved through regular practice of meditation.

The mind that is accustomed to regular meditation gets endowed with a very high level of morality. When the mind functions with a high moral standard, it remains unattached to the physical body. Therefore, mind needs proper training to comprehend this reality. Mandatory actions are those actions that are prescribed to maintain a human body. The human body is considered as a holy place, as the Brahman dwells within. Therefore, the body is to be properly nourished. Inertia leads to dispirited mind and a dispirited mind is the place for all diabolic acts. From this angle also, one has to be physically active. Though one has to act, it should always be remembered that the cause of action and the fruits of action do not belong to the doer. The Brahman is the cause of action and naturally, the fruits of actions also should be surrendered to him. But the ego prevents the mind to realize this fact and a deceptive mind dominated by ego, takes credit for the fruits of actions. If a study of the famous men is made, one can realize that such people do not get impaired by ego. Ego is one of the stumbling blocks not only for spirituality, but also for materialistically. The soul enters a body to manifest itself, and when such a body remains in a state of inertia, the soul cannot manifest its karmic account which necessitates the soul to manifests again in some other form in later births. Therefore, the stage of inertial is against the law of divinity. One has to necessarily act, but without binding oneself to such actions.