It is not true that if we had true faith we would not be sad. Prophets (as), and righteous people experienced a great deal of sadness. The Quran is full of stories in which the central theme is sadness. Sadness is a reality of life. The Quran is not there to eliminate sadness, but to navigate it. Sadness is one of the tests of life, just as happiness, and anger are tests.

The people who test your patience are a blessing.. Without them, you can't practice patience.

I should be grateful for the tough times because Allah chose me, thought I was good enough to go through it.

The more knowledge (of deen) you have the more humble you should be. Instead you are becoming judgemental.

When you pay attention to the Quran, you discover that it can only be from Allah. It becomes clearer and clearer to you that it cannot be from a human being. But many people don't perceive the Quran this way because Allah doesn't open its doors to people who do not pay attention.

The question is grateful to who? You would think grateful to Allah, but Allah didn’t mention Himself. So it could be grateful to Allah, grateful to your parents, grateful to your teachers, grateful for your health, grateful to friends. Grateful to anyone who’s done anything for you. Grateful to your employer for giving you a job. Appreciative. Grateful is not just an act of saying Alhamdulilah. Grateful is an attitude, it’s a lifestyle, it’s a way of thinking. You’re constantly grateful.

You can't just pretend that the things you watch, and the things you hear, and the places you go will not have an impact on your character. They will.