The word '**measured**' would be appropriate, and particularly appropriate for the chosen example sentence.

> b. Of aspects of language: carefully weighed or calculated; regulated, moderated, restrained. Of a person: using language in a careful, restrained way.

[OED][1]

>We should be **measuring our words carefully** because we will have to give an account for them someday.

[Bible Verses About Prayer][2]



[1]:http://www.oed.com/view/Entry/115508?rskey=GjNZ0v&result=2&isAdvanced=false#eid
[2]:http://www.patheos.com/blogs/christiancrier/2014/10/08/top-7-bible-verses-about-the-power-of-words/