Therefore my beloved brethren, be steadfast, immovable, always abounding in the work of the Lord, knowing that your toil is not in vain in the Lord. I Corinthians 15:58
Steadfast: Fixed in direction,firm in purpose, unwavering. Sometimes steadfast is immovable, another time it is steady positive movement. We need both at different times. Some defense, some offence. It is important that we don't get them confused. In the kid's song, "Roll the gospel chariot", in one verse we pick up sinners, in another we run over the devil. It is important that we don't get confused picking up the devil and running over the sinner. Sometimes we do. The Lord will help us and reward us when we are steadfast.