1. "How may 1 be sure that I have repented enough?”

Very often the real difficulty arises from a misapprehension of the meaning of repentance. There is no salvation without repentance, but it is important to see exactly what is meant by this term. It should not be confounded with penitence, which is sorrow for sin; nor with penance, which is an effort to make some satisfaction for sin; nor yet with reformation, which is turning from sin. Repentance is a change of attitude toward sin, toward self, and toward God. The original word (in the Greek Testament) literally means "a change of mind." This is not a mere intellectual change of viewpoint, however, but a complete reversal of attitude.
Now test yourself in this way. You once lived in sin and loved it. Do you now desire deliverance from it? You were once self-confident and trusting in your own fancied goodness. Do you now judge yourself as a sinner before God? You once sought to hide from God and rebelled against His authority. Do you now look up to Him, desiring to know Him, and to yield yourself to Him? If you can honestly say "Yes" to these questions, you have repented. Your attitude is altogether different to what it once was.
You confess you are a sinner, unable to cleanse your own soul, and you are willing to be saved in God's way. This is repentance. And remember, it is not the amount of repentance that counts: it is the fact that you turn from self to God that puts you in the place where His grace avails through Jesus Christ.
Strictly speaking, not one of us has ever repented enough. None of us has realized the enormity of our guilt as God sees it. But when we judge ourselves and trust the Saviour whom He has provided, we are saved through His merits. As recipients of His loving kindness, repentance will be deepened and will continue day by day, as we learn more and more of His infinite worth and our own unworthiness.
“It is not thy tears of repentance, nor prayers,
But the blood that atones for the soul;
On Him then who shed it thou mayest at once
Thy weight of iniquities roll.”