Dear Jane,
 
I, like you, get great comfort from the Psalms. Fear is an instrument of Satan, as you so correctly note, and we are vulnerable if we walk only in the flesh. But, as you so correctly pointed out, if we put on the armour of God then we will be protected and need not fear.
 
I was curious as to the meaning of the phrase "the arnmour of God" and looked it up in a concordance. The armour of God is referenced in several passages in the Holy Word. The armour appears to refer to the righteousness of Jesus and the light that He brings to our being.
 
"For we wrestle not against flesh and blood, but against principalities, against powers, against the rulers of the darkness of this world, against spiritual wickedness in high places. Wherefore take unto you the whole armour of God, that ye may be able to withstand in the evil day, and having done all, to stand." Ephesians 6:12-13
 
"By the word of truth, by the power of God, by the armour of righteousness on the right hand and on the left" 2 Cor. 6:7
 
"The night is far spent, the day is at hand: let us therefore cast off the works of darkness, and let us put on the armour of light." Romans 13:12
 
"But put ye on the Lord Jesus Christ, and make not provision for the flesh, to fulfil the lists thereof." Romans 13:14
 
Thanks for reminding me of that helpful phrase.
 
Lots of love,
 
Robert