We are all given a measure of faith (Romans 12:3), and whilst the Bible clearly shows we are not all the same, I believe that initial measure we have at salvation, is sufficient for all things – an abundant life, miracles, freedom and authority – but we don’t all use that measure to the same degree and therefore our experience does not always reflect that sufficiency.
I can’t help but see a parallel between faith, and how we use it, and the human brain.
The human brain has phenomenal capacity. It uses 20% of the body’s energy even though it makes up just 2% of the body by weight.
We all have the same but we don’t all realise it.
“Dumb” people use as much of their brain as “intelligent” people (I’m using the world’s labels here on purpose). It is true we can increase the efficiency of certain areas, build new neuron pathways and yes if you don’t use an area of your brain as much the pathways can die out but, at the end of the day, it is all there.
That sounds to be a similar description as to the differences in how Christians “use” their faith and develop (or fail to do so and watch their faith “die”).