I have never been clearer about an assignment being "from God." We live in a dark, evil, fallen world. Ephesians 6:10-20 tells us we fight not man but the powers of darkness in the spiritual realm.
I once sat under a pastor who lambasted the public school system as a bastion of evil and to be avoided at all costs. I was treated like part of the problem by virtue of working in the public school system. Guess what? God puts His people there, too. Not everyone can homeschool or send their kids to private school. Jesus didn't come for the well, but for the sick. He needs His people in ALL vocations to be His light in a sick, fallen world. May I be that light for someone for the time I have left.
Put on the whole armour of God, that ye may be able to stand against the
wiles of the devil.
For we wrestle not against flesh and blood but against principalities, against
powers, against the rulers of the darkness of the world, against spiritual
wickedness in high places.
Wherefore take unto you the whole armour of God, that ye may be able to
withstand in the evil day, and having done all, to stand.
Stand therefore, having your loins girted about with truth, and having on the
breastplate of righteousness;
And your feet shod with the preparation of the gospel of peace;
Above all, taking the shield of faith, wherewith ye shall be able to quench all
the fiery darts of the wicked.
And take the helmet of salvation, and the sword of the Spirit, which is the word
Praying always with all prayer and supplication in the Spirit, and watching
thereunto with all perseverance and supplication for all saints.