Some people have tremendous amounts of intellectual knowledge but haven't practiced acceptance, non-attachment and equanimity in day to day life.
Buddhism: In Buddhist terminology, such a person has copious amounts of Sutamayā paññā (knowledge derived from hearing) and Cintāmayā paññā (knowledge derived from intellectual analysis) but lacks Bhāvanā mayā paññā (knowledge derived from direct experience) due to lack of practice.
Advaita Vedanta: In Advaita Vedanta terminology, such a person has acquired knowledge, thanks to 'Shravanam' (hearing spiritual wisdom) and 'Mananam' (evaluation, analysis) but lacks 'Nidhidhyasanam' (meditation, absorption, practice).
Sikhism: In Sikh terminology, the person has developed in Dharam Khanda (initial exposure to spiritual knowledge) and Gyan Khanda (deep knowledge of scriptures; intellectual knowledge) but needs further development in Shram Khanda (assiduous practice of what has been learnt).
Summary: Without practice, we are limited to intellectual understanding. Every tradition implores us to practice so that acceptance, non-attachment and equanimity become second nature to us.
S N Goenka narrates the story of three sick fellows in one of his discourses at the 10-day Vipassana retreat. Let's call them A, B and C. Each fellow visits his own doctor who diagnoses the disease correctly and gives medicine.
The story above illustrates that having faith and discrimination are awesome qualities. However, we still have to practice.
The Vedas end with the phrase 'Neti, Neti' which literally mean 'This is not it; this is not it.' This phrase has multiple interpretations. One interpretation of 'Neti, Neti' is that an intellectual understanding of the Vedas and being able to give discourses on Vedas is not the end goal! What's important is practice so that we get to experience what's written in the Vedas in our personal lives!