"And we know...." God's promise is absolute! You can "KNOW" ...
"...work together...." The successes and failures; the right and wrong decisions;
"... for good...." The only "good" that results from some bad things may be simply... "I'll never do that again".... or the tragic death of a friend or loved one may result in someone else's salvation or inspire Christian repentance.
Here Is The Condition If "all things are to work together for your good"
"... to them that love God...." This is not physical love or lustful love or infatuation or liking love or even friendship love. This is "agapao" love, a holy, total commitment love. It is the same Greek word, "agapao", as in John 3:16...
"For God so loved the world, that he gave his only begotten Son, that whosoever believeth in him should not perish, but have everlasting life."
When you "know" this is true and you trust God to perfect it in your life, all things, no matter what, good or bad which come your way will work for you.
That knowledge will get you through all of the trials and difficulties of life. It has for me. RB