'Things' in the Bible

For we all stumble and sin in many ways. If anyone does not stumble in what he says [never saying the wrong thing], he is a perfect man [fully developed in character, without serious flaws], able to bridle his whole body and rein in his entire nature [taming his human faults and weaknesses].

In the same sense, the tongue is a small part of the body, and yet it boasts of great things.See [by comparison] how great a forest is set on fire by a small spark!

Out of the same mouth come both blessing and cursing. These things, my brothers, should not be this way [for we have a moral obligation to speak in a manner that reflects our fear of God and profound respect for His precepts].

But above all, my fellow believers, do not swear, either by heaven or by earth or with any other oath; but let your yes be [a truthful] yes, and your no be [a truthful] no, so that you may not fall under judgment.