'Firm' in the Bible

but Christ is faithful as a Son over His [Father’s] house. And we are His house if we hold fast our confidence and sense of triumph in our hope [in Christ].

For we [believers] have become partakers of Christ [sharing in all that the Messiah has for us], if only we hold firm our newborn confidence [which originally led us to Him] until the end,

For he was [waiting expectantly and confidently] looking forward to the city which has foundations, [an eternal, heavenly city] whose architect and builder is God.

Cut through and make smooth, straight paths for your feet [that are safe and go in the right direction], so that the leg which is lame may not be put out of joint, but rather may be healed.

Therefore, since we receive a kingdom which cannot be shaken, let us show gratitude, and offer to God pleasing service and acceptable worship with reverence and awe;