Heliotropium - Counting our Injustices as Blessings

I'm reading Heliotropium - Conformity Of The Human Will To The Divine by Father Jeremias Drexelius. I would highly suggest it to any Christian or anyone interested in Christian phylosophy. It's a very heavy read. I just read a chapter discussing how we should view others injustice towards us as blessings. In all things we should look to God for nothing happens but through him. If someone does some great evil to us, it is permitted by God himself only because He knows a greater good will come of it. What reason do we have to complain about an event that Our Lord Permitted? Interesting...