This fence separates the horse pasture and the woods. Animals of some kind keep a little trail down the fence line so that it can be navigated to the center of the woods where you can enter the woods at a place where the brush is relatively low.
Of course I am speaking of figurative "deep dark woods," the kind in literature which symbolize dark days of our lives. Depression comes to the great and the small at one time or another in life.
Those kinds of days are described by David and others in the Bible. David was a "man after God's own heart." He was a great warrior, loved and idolized by many, and hated and hunted by others, such as King Saul, whom David remained loyal to, until the day he died. David offered his services in good faith to King Saul, served him very well and with honor, but King Saul became jealous of his popularity with the people, and hatred and envy rose up in his heart.
At one point in Psalms 38, David expressed the following state of mind in himself.
all day long I go about mourning.
7 My back is filled with searing pain;
there is no health in my body.
8 I am feeble and utterly crushed;
I groan in anguish of heart.
my sighing is not hidden from you.
10 My heart pounds, my strength fails me;
even the light has gone from my eyes.
according to your unfailing love;
according to your great compassion
blot out my transgressions.
2 Wash away all my iniquity
and cleanse me from my sin.
and my sin is always before me.
4 Against you, you only, have I sinned
and done what is evil in your sight;
so you are right in your verdict
and justified when you judge.
5 Surely I was sinful at birth,
sinful from the time my mother conceived me.
6 Yet you desired faithfulness even in the womb;
you taught me wisdom in that secret place.
wash me, and I will be whiter than snow.
8 Let me hear joy and gladness;
let the bones you have crushed rejoice.
9 Hide your face from my sins
and blot out all my iniquity.
and renew a steadfast spirit within me.
11 Do not cast me from your presence
or take your Holy Spirit from me.
12 Restore to me the joy of your salvation
and grant me a willing spirit, to sustain me.
so that sinners will turn back to you.
14 Deliver me from the guilt of bloodshed, O God,
you who are God my Savior,
and my tongue will sing of your righteousness.
15 Open my lips, Lord,
and my mouth will declare your praise.
16 You do not delight in sacrifice, or I would bring it;
you do not take pleasure in burnt offerings.
17 My sacrifice, O God, is a broken spirit;
a broken and contrite heart
and lean not on your own understanding;
6 in all your ways submit to him,
and he will make your paths straight.
5 Let your gentleness be evident to all. The Lord is near.
6 Do not be anxious about anything, but in every situation, by prayer and petition, with thanksgiving, present your requests to God.
7 And the peace of God, which transcends all understanding, will guard your hearts and your minds in Christ Jesus.
8 Finally, brothers and sisters, whatever is true, whatever is noble, whatever is right, whatever is pure, whatever is lovely, whatever is admirable—if anything is excellent or praiseworthy—think about such things.
8 We are hard pressed on every side, but not crushed; perplexed, but not in despair;
14 because we know that the one who raised the Lord Jesus from the dead will also raise us with Jesus and present us with you to himself.