Summary
This quote suggests that when someone is proficient in their mother tongue, it is unlikely for them to achieve mastery in another language. It implies that a person's native language influences their perception and understanding of the world to such a degree that it becomes challenging to grasp another language on the same level. This could mean that while individuals can become fluent or even highly skilled in a second language, achieving the same level of profound insight, aptitude, and intuitive expression in that language as they possess in their mother tongue is highly improbable.