Prevention is better than cure

What would you prefer? To sin and find Forgiveness and then have to work on keeping from commiting that sin again (would you really treat the Blood of Jesus that way?!); or to resist the temptation in the first place and thus Honour God, keep yourself clean and become a master regarding that sin?

1 John 2:1-2 My little children, these things I write to you, so that you may not sin. And if anyone sins, we have an Advocate with the Father, Jesus Christ the righteous. 2And He Himself is the propitiation for our sins, and not for ours only but also for the whole world.

Romans 6:12 Therefore do not let sin reign in your mortal body, that you should obey it in its lusts.

1 Corinthians 15:34 Awake to righteousness, and do not sin; for some do not have the knowledge of God. I speak this to your shame.

As Christians we are supposed to STOP SINNING! Jesus told the woman caught in the act of adultery to "Go and sin no more" [see John 8:11]

True, Jesus Christ's blood covers all our sins (if we repent of them), but how can we who died to sin live any longer in it?! [see Romans chapter 6]

When tempted don't allow the temptation to dictate to you that it's fine to sin because there is always Forgiveness...that's not true...remember sin is deceitful:

Hebrews 3:12-14 12 'Beware, brethren, lest there be in any of you an evil heart of unbelief in departing from the living God; 13 but exhort one another daily, while it is called “Today,” lest any of you be hardened through the deceitfulness of sin. 14 For we have become partakers of Christ if we hold the beginning of our confidence steadfast to the end,'

Also, Paul says that there is no excuse for not resisting temptation:

1 Corinthians 10:13 No temptation has overtaken you except such as is common to man; but God is faithful, who will not allow you to be tempted beyond what you are able, but with the temptation will also make the way of escape, that you may be able to bear it.

As disciples we have a responsibility to keep ourselves clean:

1 John 3:3 And everyone who has this hope in Him purifies himself, just as He is pure.

2 Corinthians 7:1 Therefore, having these promises, beloved, let us cleanse ourselves from all filthiness of the flesh and spirit, perfecting holiness in the fear of God.

And to prevent ourselves from becoming tempted in the first place:

Romans 13:14 But put on the Lord Jesus Christ, and make no provision for the flesh, to fulfill its lusts.

This requires Discipline from God and self discipline on our part, are we willing to receive it and conform to it?