Living beings are proportionately endowed with intelligence in terms of their previous activities. All living beings are not equally endowed with the same quality of intelligence because behind such development of intelligence is the control of the Lord, as declared in the Bhagavad-gita (15.15). As Paramatma, Supersoul, the Lord is living in everyone’s heart, and from Him only does one’s power of remembrance, knowledge and forgetfulness follow (mattah smrtir jnanam apohanam ca). One person can sharply remember past activities by the grace of the Lord while others cannot. One is highly intelligent by the grace of the Lord, and one is a fool by the same control. Therefore the Lord is Dhiyam-pati, or the Lord of intelligence.
The conditioned souls strive to become lords of the material world. Everyone is trying to lord it over the material nature by applying his highest degree of intelligence. This misuse of intelligence by the conditioned soul is called madness. One’s full intelligence should be applied to get free from the material clutches. But the conditioned soul, due to madness only, engages his full energy and intelligence in sense gratification, and to achieve this end of life he willfully commits all sorts of misdeeds. The result is that instead of attaining an unconditional life of full freedom, the mad conditioned soul is entangled again and again in different types of bondage in material bodies. Everything we see in the material manifestation is but the creation of the Lord. Therefore He is the real proprietor of everything in the universes. The conditioned soul can enjoy a fragment of this material creation under the control of the Lord, but not self-sufficiently. That is the instruction in the Isopanisad. One should be satisfied with things awarded by the Lord of the universe. It is out of madness only that one tries to encroach upon another’s share of material possessions.
Source: A.C. Bhaktivedanta Swami Prabhupada (2014 edition), “Srimad Bhagavatam”, Second Canto, Chapter 4 – Text 20