Mental intelligence and common sense are essential for outstanding achievement because they involve your natural ability to comprehend difficult concepts quicker and to analyse them clearly and incisively.

your natural ability of comprehension of difficult concepts quickly and clear and incisive analysis of it.

one’s natural ability for the comprehension of difficult concepts quickly and analysing them clearly and incisively.

your natural ability to comprehend difficult concepts quicker and to analyse them clearly and incisively.

one’s natural ability to comprehend difficult concepts quickly and to analyse them clearly and incisively.