Be strong in the Lord, and in the power of His might.

Ephes. 6:10-13
Finally, my brethren, be strong in the Lord, and in the power of his
might. [11] Put on the whole armour of God, that ye may be able to
stand against the wiles of the devil. [12] 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. [13] 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.