Bearing fruit in good works

What is a good work? This has puzzled me. In the scriptures we are exhorted many times to do good works (Matthew 5:16, Ephesians 2:10, Titus 2:14) I believe the key to figuring out what good works are is located in Titus 3:8. There Paul encourages Titus to constantly teach the right doctrine so the church can be devoted to good works. Then he says these things are good and profitable for all men. Good works are what is good and profitable. Many times we only think of good works as connected to full time ministry or some church activity but good works are bigger than that and often times happen outside the four walls of the church. Babysitting for a single mom, feeding the homeless, signing petitions against unjust laws, helping out at the boys and girls club can be defined as good works and followers of Christ ought to be leading the way. This is what it means to bear fruit in good works or to be fruitful and multiply in good works.