1 John 5:4
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 ‘elohiym el-o-heem’ plural of 433; gods in the ordinary sense; but specifically used (in the plural thus, especially with the article) of the supreme God; occasionally applied by way of deference to magistrates; and sometimes as a superlative:–angels, X exceeding, God (gods)(-dess, -ly), X (very) great [ones], judges, X mighty [ones].
Faith: 530 ’emuwnah em-oo-naw’); or (shortened) >emunah {em-oo-naw’ feminine of 529; literally firmness; figuratively security; morally fidelity:–faith(-ful, -ly, -ness, (man)), set office, stability, steady, truly, truth, verily.

