[Imampaictjg]

I'd say in short that it's all about how you react to what befalls over you.

If something "good" happens to you and you give thanks to Allah, that was a blessing.
If something "bad" happens to you and you persevere with sabr and ask Him for help and accept his Qadr, that too will become a "blessing" for you, as you turned to Allah then too.

While,
If something "good" happens to you and you grow kibr in your heart, that was actually a curse for you.
If something "bad" happens to you and you don't turn to Allah for help or "complain" to him, that indeed was a curse.

So "good" and "bad" in reality are such according to how we "react" to them.

Everything in this life is a test, both "good" happenings and "bad" ones.
You don't know "why" you are tested nor what's there hidden for you in the future, nor you can know already now in this life if you'll be saved or not, but you know how to "react" to pass these tests: always remembering Allah in every condition and submitting to him..

And Allah knows best.

MashaAllah Umar,great post...and very beneficial.
Every thing which affects one,s mind is significant,otherwise these are just 'events'.
Where Quran says 'no fear on them nor will they grieve'....talks of their mental response to an event or events.Fear is -for future,HUZN,on the other hand is being sorry for the past events.So these two things can not affect a Momen mentally,incidents will happen,they may suffer physical,mental torture,they will be tested with fear.....but their response to every event will be different ie with peace full acceptance and surrender to the will of Allah swt.
Jazak. for your post