(Kadamba Kanana Swami, 24 April 2014, Radhadesh, Belgium, Caitanya Caritamrta Lecture)
Who can say that they understand the Supreme Personality of Godhead? Even Lord Brahma was praying for 60 000 years to the dust of the feet of the gopis, just trying to understand the residents of Vrindavan. So, who can understand Krsna by a dint of intelligence or logic? Still, we need to logically understand Krsna consciousness.
We need to not speculate and try to understand what the truth is but rather, once we know the truth then we have to try to understand it with logic and argument. Srila Prabhupada certainly was one who presented a lot of logic and argument – things like the Big Bang for example. So, logic and intelligence is required but be faithful to the conclusions of the scriptures. We should always be accepting of the limitations of logic and try to understand from the scriptures what the truth is and using logic for understanding how it is true.