It means offering complete obedience filled with affection to Krishna, with a view to satisfying Him, pleasing Him, and making Him happy, but also to fulfill a wish, desire, or will expressed by the Lord, and interceding on His behalf with the beings of this material world, in order to impart to them the true knowledge of which God is the author, for their well-being, even their attainment of deliverance.
It means using all one's senses, in order to lovingly place them exclusively in the service of the spiritual senses of the Lord. It is to surrender oneself completely to the Lord, to offer Him with undisguised joy all the fruits of our works, to serve Him with love and devotion, to take pleasure in it, and to love pleasing Him.
It is to take pleasure in contributing to the joy of Lord Krishna, to love pleasing Him, and to participate in His divine joy.
It is to be constantly inclined to please the Lord, to sing or listen to His glories, as well as to describe His divine attributes at all times.
Acting in the framework of loving and devotional service imbued with attachment to the Lord, coupled with total absorption or meditation in the Supreme Being, it is to dedicate one's life and body to the mission of Krishna, the Supreme Personality of Godhead.
In truth, God does not want us to suffer, but because of our individualism, our unbridled desire to develop sensual pleasures, our desire to constantly strive for materialism, to increase our material wealth and consolidate our power, our desire to knowingly ignore the fact that our thoughts, words, and actions generate effects that, in turn, cause negative consequences that can ultimately cause suffering to others, and our disrespect for and failure to apply divine precepts and commandments, suffering is useful and necessary, because it allows us to regain our senses, to no longer act irresponsibly, and to modify our behavior by applying the scriptural prescriptions from the Vedas, the original holy scriptures.
It is through suffering that man erases his faults, reduces the number of accumulated sins, and becomes aware of the pain his sinful actions cause, leading him to resolve never to do it again.
The Lord concludes by saying: After having passed through all the conditions of hellish suffering and having experienced the lowest forms of animal life in the natural order, the spiritual being, having thus purged his faults, is reborn again in human form on this earth.
Illnesses of a spiritual nature.
In truth, human beings are subject to two types of illnesses. The first is material in nature, and the second, the main one, is spiritual in nature.