John Wesley’s NotesPsalms 12

Prevail - By raising and spreading evil reports concerning him. Our own - At our own disposal to speak what we please, who can control or restrain us?

Puffeth - From him that despises him, and hopes to destroy him with a puff of breath.

Pure - Without the least mixture of falsehood; and therefore shall infallibly be fulfilled.

Thou shalt keep them - Thy words or promises: these thou wilt observe and keep, both now, and from this generation for ever.

Walk - They fill all places, and go about boldly and securely.