The best example Jesus gives for repentance is found as He addresses those who have become lukewarm and comfortable in the churches, those who believe they are secure in Him because of their "salvation" even though they have not "walked worthy" and been diligent to "press in."
"Wake up, and strengthen what remains and is about to die, for I have not found your works complete in the sight of my God. 3 Remember, then, what you received and heard. Keep it, and repent. If you will not wake up, I will come like a thief, and you will not know at what hour I will come against you. 4 Yet you have still a few names in Sardis, people who have not soiled their garments, and they will walk with me in white, for they are worthy." - Rev 3:2-4 ESV
Will the Lord find us "worthy" in that Day, because we have truly "turned from our sin" and "held fast" to His commands? Or is the "fruit" of our life still show the deeds of our "old man" of "flesh and blood" which cannot inherit the Kingdom?
"Therefore bear fruits worthy of repentance" (Matt 3:8)
Indeed, God only knows we've truly repented if He sees a change (for the better) in our behavior, choices and deeds. The "fruit" of our life will prove our repentance. Biblical repentance is not something abstract, or a feeling, or mental assent; but a change of action on our part.
May we each be bearing the fruit of righteousness today, showing God we mean business and are receiving His commands to "turn from our sin and does what is lawful and right" and "turn to the living and true God."
For without a change of behavior, God cannot know that we have turned to Him. Let us not "honor Him with our lips" and words of sorrow and repentance, unless we actually mean to "stop sinning" as Jesus has commanded us. The proof is in what we do. Jesus has done His part... will we do ours?
This is a hard Word for many to receive. As the Lord Jesus warned, "because of the increase of lawlessness, the love of many will grow cold." (Matt 24:12)
Will we "turn back and walk with Him no more" (John 6:66) because His Truth makes us uncomfortable, or will we actually "Repent and be converted, that our sins may be blotted out, so that times of refreshing may come from the presence of the Lord." (Acts 3:19)
The choice is ours.