'Constructive' in the Bible
All things are legitimate [permissible -- "and we are free to do anything we please], but not all things are helpful (expedient, profitable, and wholesome). All things are legitimate, but not all things are constructive [to character] and edifying [to spiritual life].
But [on the other hand], the one who prophesies [who interprets the divine will and purpose in inspired preaching and teaching] speaks to men for their upbuilding and constructive spiritual progress and encouragement and consolation.
What then, brethren, is [the right course]? When you meet together, each one has a hymn, a teaching, a disclosure of special knowledge or information, an utterance in a [strange] tongue, or an interpretation of it. [But] let everything be constructive and edifying and for the good of all.