Most would agree that to have ‘firmness’ one must first seek what one will be firm on. In the Hebrew Bible the word for firmness is ‘faith’ – a calling to become firm in the wisdom of Israel’s ‘Elohiym – not the ways of world.
In Psalms 1: 1-3 King David tells us where to ‘seek that we may find’, paraphrasing YH’shua.
New King James Version (NKJV)
4 For whatever is born of ‘God’(ha-‘Elohiym: the-Great,the-Mighty – [ones], etc..)overcomes the world. And this is the victory that has overcome the world—our[a]‘faith’ (’emuwnah:firmness, stability, truth, etc…).
Strong’s Hebrew Lexicon:
G-d: 430 ‘elohiymel-o-heem’ plural of 433; gods in the ordinary sense; butspecifically used (in the plural thus, especially with the article) of the supreme God; occasionally applied by way of deference tomagistrates;and sometimes as a superlative:–angels, X exceeding, God (gods)(-dess, -ly), X (very)great[ones], judges, Xmighty [ones].