2 Corinthians 6:7

... in truthful speech and in the power of God; with weapons of righteousness in the right hand and in the left; ...

in truthful speech
2 Corinthians 4:2 Rather, we have renounced secret and shameful ways; we do not use deception, nor do we distort the word of God. On the contrary, by setting forth the truth plainly we commend ourselves to every man's conscience in the sight of God.

and in the power of God
2 Corinthians 4:7 But we have this treasure in jars of clay to show that this all-surpassing power is from God and not from us.

with weapons of righteousness
Romans 13:12 The night is nearly over; the day is almost here. So let us put aside the deeds of darkness and put on the armor of light.
2 Corinthians 10:4 The weapons we fight with are not the weapons of the world. On the contrary, they have divine power to demolish strongholds.
Ephesians 6:10-18 Finally, be strong in the Lord and in his mighty power. Put on the full armor of God so that you can take your stand against the devil's schemes. For our struggle is not against flesh and blood, but against the rulers, against the authorities, against the powers of this dark world and against the spiritual forces of evil in the heavenly realms. Therefore put on the full armor of God, so that when the day of evil comes, you may be able to stand your ground, and after you have done everything, to stand. Stand firm, then, with the belt of truth buckled around your waist, with the breastplate of righteousness in place, and with your feet fitted with the readiness that comes from the gospel of peace. In addition to all this, take up the shield of faith, with which you can extinguish all the flaming arrows of the evil one. Take the helmet of salvation and the sword of the Spirit, which is the word of God. And pray in the Spirit on all occasions with all kinds of prayers and requests. With this in mind, be alert and always keep on praying for all the saints.

Scriptures taken from the Holy Bible, New International Version® NIV®, Copyright© 1973, 1978, 1984 by International Bible Society. Used by permission. All rights reserved worldwide.