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]OED
We should be measuring our words carefully because we will have to give an account for them someday.
[Bible Verses About The Power of Words][2]Bible Verses About The Power of Words
'Measured' implies thoughtful preparation and also implies care about content as stated in Ecclesiastes :
Be not rash with thy mouth, and let not thine heart be hasty to utter any thing before God: for God is in heaven, and thou upon earth: therefore let thy words be few.
[Ecclesiastes 5:2][3]Ecclesiastes 5:2 : [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/ [3]:https://www.kingjamesbibleonline.org/Ecclesiastes-5-2/