Ecclesiastes 1:13 King James Version

And I gave my heart to seek and search out by wisdom concerning all things that are done under heaven: this sore travail hath God given to the sons of man to be exercised therewith.

Hebrews 5:14 King James Version

But strong meat belongeth to them that are of full age, even those who by reason of use have their senses exercised to discern both good and evil.

The two exercises here are physical and spiritual.

Solomon describes his exercise as a sore travail. Those are physical sensations.

In Hebrews we discover coming to spiritual maturity in discernment, to judge good and evil.

We work in one world and worship in the other.

Which one influences us more than the other?

That is a personal question which can only be answered by each individual. There is no judgment here except to recognize both forces are at work in us all.

An old American Indian proverb says we have two wolves in us and which one is stronger is the one we feed the most. That is natural, not spiritual.

Hebrews 5:14 tells us “by reason of use” which is not a matter of being fed but rather in the use of the spiritual senses we have been given.

We know how to exercise our natural senses but how do we exercise our spiritual senses?

Habakkuk 2:4 King James Version

Behold, his soul which is lifted up is not upright in him: but the just shall live by his faith.

The soul is not upright, it is sensual. Christ in us justifies us so that we can walk by faith.

Romans 3:26 King James Version

To declare, I say, at this time his righteousness: that he might be just, and the justifier of him which believeth in Jesus.