sacred cow of modern christianity DIABETES is different from MENTAL DEPPRESSION. A very cunning example used by the speaker in which he espouses drug dependent treatment on the realm of spiritual malady. The problem of the mind is spiritual and can only be solve by spiritual medicine. Worry affects our physical features and because of this, Jesus commanded his listener NOT to worry at all - and He gave the reason why. Worrying is disobedience to Jesus command and we cannot use chemical imbalances for our disobedience and disbelief. Psychology, in my opinion, is the modern sacred cow of Christianity today.
He will work. Yes, God will finish what He began in His grace. God will continue the work He begun in us and will conform us to the image of Christ, will perfect us, for His glory. He worked, He is working and He will work in us and for us.