Paul warned Christians about false teachers who would persuade them to boast in themselves instead of in Christ.
After the Covenant of Works/Life resulted in failure and death for humans, God dealt with them on the basis of his grace, or free...
Even though his people grumbled and quarreled, the Lord satisfied their needs at his own expense.
Although Christians may suffer much, and many things are against us, we will end up being hyper-victorious in Christ.