This article outlines, make that spells out, what a bishop should teach:

In exercising their duty of teaching - which is conspicuous among the principal duties of bishops - they should announce the Gospel of Christ to men, calling them to a faith in the power of the Spirit or confirming them in a living faith. They should expound the whole mystery of Christ to them, namely, those truths the ignorance of which is ignorance of Christ. At the same time they should point out the divinely revealed way to give glory to God and thereby to attain to eternal happiness.

They should show, moreover, that earthly goods and human institutions according to the plan of God the Creator are also disposed for man's salvation and therefore can contribute much to the building up of the body of Christ.

Therefore, they should teach, according to the doctrine of the Church, the great value of these things: the human person with his freedom and bodily life, the family and its unity and stability, the procreation and education of children, civil society with its laws and professions, labor and leisure, the arts and technical inventions, poverty and affluence. Finally, they should set forth the ways by which are to be answered the most serious questions concerning the ownership, increase, and just distribution of material goods, peace and war, and brotherly relations among all countries.

Two examples of bishops who put the above into practice:

The Shepherd

The Homeless Bishop

Jesus, may all bishops put the above words into practice