It is usually unbearably painful to read a book by an author who knows way less than you do, unless the book is a novel.
It is never easy to endure pain nor uncomfortable situation. It is seems easy to quit to avoid the pain.If you quit you will suffer later. It is far better to endure the pain now and enjoy later. Life...
(a.) Capable of being endured or borne; sufferable.
Water is soft and humble, but it is the most powerful and is the most endurable.