Not succeeding, not failing to try at all though. Somewhere in the middle, but certainly not a feeble attempt.
Being a Christian, having the Spirit at work in you, doesn't automatically guarantee success at everything you try. You might fail to put off temptation one time, you might fail to see what is the right judgment when your kids misbehave, you will certainly get it wrong some time where your spouse is concerned!
Failure is not an excuse to give up. Sadly, some will. But others will endure to the end and receive the reward. How we continue to strive in one thing, not to be quick-tempered for example, parallels how we continue to strive for perfection in the rest of our lives.
Keep trying your best, trust God for your shortcomings, and to complete you at Jesus' return. At this time, the fruit of our feeble but valiant strivings will be transformed in the twinkling of an eye, and we will rejoice forevermore in the presence of the Lord.