'Things' in the Bible

Therefore, brethren, be all the more diligent to make certain about His calling and choosing you; for as long as you practice these things, you will never stumble;

Therefore, I will always be ready to remind you of these things, even though you already know them, and have been established in the truth which is present with you.

And I will also be diligent that at any time after my departure you will be able to call these things to mind.

Since all these things are to be destroyed in this way, what sort of people ought you to be in holy conduct and godliness,

Therefore, beloved, since you look for these things, be diligent to be found by Him in peace, spotless and blameless,

as also in all his letters, speaking in them of these things, in which are some things hard to understand, which the untaught and unstable distort, as they do also the rest of the Scriptures, to their own destruction.