This verse is from the Parable of the Prodigal Son in Luke 15. It represents the moment of repentance and humble return for the son who had squandered his inheritance. Let's break down what it means:

"I will get up and go to my father...": This signifies a decisive act of change. The son, having reached rock bottom, chooses to leave his current miserable situation and actively return to his father's house. This is a turning point, a decision to seek reconciliation.
"...and will tell him, “Father, I have sinned against heaven...":
"Father": This acknowledges the father-son relationship, but now with a sense of unworthiness. He still recognizes the paternal bond, even after his betrayal.
"I have sinned": He is admitting his wrongdoing. He is taking responsibility for his actions instead of making excuses. This is genuine remorse.
"against heaven": This is significant. It implies a sin not just against his father, but against a higher authority, against God, or against what is right and moral. By recognizing his sin against heaven, the son understands the gravity of his actions and his relationship to God. He is acknowledging that his actions had wider implications than just affecting his father.
"...and in your sight.": He acknowledges his sin directly to his father, accepting his accountability. He recognizes he has deeply hurt and disappointed his father. This shows humility and sincerity.

In essence, the verse describes:

Repentance: A genuine feeling of sorrow and regret for his actions.
Humility: Recognizing his unworthiness and dependence on his father's mercy.
Confession: Acknowledging his sin, both against God and his father.
Reconciliation: A desire to restore the broken relationship with his father.
Turning Away from Sin: It's not just saying sorry, but resolving to change his ways.

The verse is a powerful illustration of how one should approach God after falling short. It highlights the importance of acknowledging our sins, seeking forgiveness, and turning back to a loving and merciful God.