J.C. Ryle once said.....

Do you belong to that class of persons who really profess Christian faith and Christian obedience, and are you trying, however weakly, to follow Christ in the midst of an evil world? I think I know something of what goes on in your heart. You sometimes feel that you will never persevere to the end, and will some day give up your profession of faith. You are sometimes tempted to write bitter things against yourself, and to believe that you have no grace at all. I am afraid there are myriads of true Christians in this condition, who go trembling and doubting toward heaven. However, in spite of all their groans and doubts and fears, they do not turn back, but press on, though faint.
Now, my advice to all such persons is very simple. Pray every morning and evening of your life, “Lord, increase my faith.” Cultivate the habit of fixing your eyes more simply on Jesus Christ, and try to know more of the fulness there is laid up in Him for every one of His believing people. Do not be always pouring over the imperfections of your own heart, and dissecting your own sins. Look up! Look more to your risen Head in heaven, and try to realize more and more that the Lord Jesus not only died for you, but that He also rose again, and that He is ever living at God’s right hand as your Priest, your advocate, and your Almighty Friend. (J.C. Ryle)