'Firmly' in the Bible

and that the Messiah may dwell in your hearts through faith. I pray that you, being rooted and firmly established in love,

From Him the whole body [the church, in all its various parts], joined and knitted firmly together by what every joint supplies, when each part is working properly, causes the body to grow and mature, building itself up in [unselfish] love.

Therefore do not be foolish and thoughtless, but understand and firmly grasp what the will of the Lord is.

Therefore, put on the complete armor of God, so that you will be able to [successfully] resist and stand your ground in the evil day [of danger], and having done everything [that the crisis demands], to stand firm [in your place, fully prepared, immovable, victorious].