While I believe we should not be ignorant of the devil's devices, I think our focus should be primarily on God (and glorifying Him) and not the devil (or worrying if he is under every rock or tree). God is our Savior and protector if we trust in Him and if we put on the whole armor of God. So I believe we should focus on loving God with all our hearts, minds, and souls and in loving all people (Including our enemies) according to His Word.
Finally, brethren, whatsoever things are true, whatsoever things are honest, whatsoever things are just, whatsoever things are pure, whatsoever things are lovely, whatsoever things are of good report; if there be any virtue, and if there be any praise, think on these things.
(Philippians 4:8).