From Dave Black Online:

Question for you. In Phil. 2:16 did Paul say we are to “hold fast to” or “hold forth” the Word of life? My personal preference is the latter interpretation because I think it better fits the context (“shining as lights in the world”). Plainly, however, Paul could have intended both meanings (thus making the expression a case of intentional ambiguity). His point, then, would be that while it is important, vital even, to hold fast to the Gospel (i.e., preserve and protect it from error), that is never enough. We must protect and proclaim the life-giving Word. This notion is consistent with everything we read in the Pauline epistles. Paul was no mean theologian, but he was every bit as much a great evangelist, perhaps more so. And, since he invites his readers to share his attitude in these matters, he implies that doctrine is never sufficient in itself, unless that doctrine is applied in practical ways. This dual emphasis upon the sanctity of the Gospel and our responsibility to share it with others is present again and again in Paul. To put it another way, a church should never be centered on itself. Every true Bible church is also a missional church.

(Dr. David Alan Black is author of Energion titles The Jesus Paradigm and Christian Archy as well as co-editor of the Areopagus Critical Christian Issues series.  His material is used by permission.)