We have to deny self of what the flesh desires or wants. Being confident in this flesh can often lead to a downfall as it did for Peter.
Matthew 26:35 Peter said unto him, Though I should die with thee, yet will I not deny thee. Likewise also said all the disciples.
“Peter presume too much on his own strength, Matt 26:35: “Thou I should die with Thee, yet will I not deny Thee.” But how soon was his confidence shaken and blow down with the breath of a maid? … The trembling reed often stands when the confident cedar falls.”
The Duty of Self-Denial – Thomas Brooks