Cling to what is good. The Christian should oppose every wickedness and despise the sins and weaknesses of the flesh that so plague each of us. It is logical that Paul puts both of these together. One cannot hate evil without loving and practicing good. The Christians should love, support and encourage every good work.
Christians are to have a family relationship with one another.
This denotes the tender feeling that a physical brother and sister has for one another. This shows the kind of attitude that each Christian is to have toward one another. We are to give preference to other brethren and not seek to promote ourselves. We should not let our zeal for the Lord slip, as often happens when we are Christians for awhile. This should be the motivation behind all our work in the world.