Al Allaamah Zayd bin Haadi Al Madkhalee (rahimahullah) said:

“And People are not exactly similar, the reality is that ignorance is like (different levels of) darknesses, and ignorance is from the greatest calamity and trial, especially when Allaah grants and favours you with an opportunity in your life for you to learn (Islamic knowledge), you instead spend your entire lifetime in enjoying your worldly physical existence, this is what (true and great) loss is.”

‘Awn Al Ahad As Samad Sharh Adabul Mufrad 28/1 – Shaykh Zayd Bin Haadi