Some helpful thoughts here from J.D. Greear:
If you were honest, you’d probably admit there are moments when you do not feel “Christian” at all. Moments in which you care more about what’s coming on TV that night than you do the spread of the kingdom of God in the world. Moments in which you have fallen to that same old temptation for the thousandth time. Moments when God feels distant, almost like a stranger. Seasons in which your emotions for Him are lukewarm, if not downright cold. When you don’t jump out of bed in the morning hungry for His Word. When your mind wanders all over the place during prayer—that is, when you can bring yourself to pray. Moments when you’re not even sure you believe all this stuff. Does that sound familiar to you? Times like that are familiar to me. Not all the time, not even most of the time, but certainly more often than I’d care to admit.
What do you do in that moment? Pray “the sinners’ prayer” again? Should I call my old church and have the pastor fill up the all-too-familiar baptismal?
The answer is to keep believing the gospel, to keep your hand on the head of the Lord Jesus Christ. No matter how we feel at any given moment, how encouraged or discouraged we feel about our spiritual progress, how hot or cold our love for Jesus, the answer is always the same—exercise faith in the gospel.
On your very best of days, you must rest all your hopes on God’s grace to you in Christ. On your worst of days, it should be your refuge and your boast. Your posture should always be one of dependence on it.
Many people assume the “feeling” of being saved indicates whether or not they actually are saved. Feelings, however, are fickle and dangerously misleading, and Scripture never points us to our “feelings” for assurance. Feelings come from assurance; they are not the basis for it. Assurance is based on the fact of Christ’s finished work; our “feelings” of being saved come from faith in that finished work.
(HT: Vitamin Z)