When we really mature in our spiritual life, we see more, we know more, we feel more, we do more, and we repent more. It is all in proportion to our closeness to God! We are, in short, growing in grace (as Peter said in II Peter 3:18).
No one who neglects the spiritual big four—Bible study, prayer, meditation, and occasional fasting—can expect to make much progress in sanctification because these are the channels through which spiritual strength flows from God. This is why having access to God through Jesus Christ is so important. These efforts produce faith and then obedience, and fresh supplies of His grace flows.
There are no spiritual gains without pains. Would we expect a crop from a farmer who never even looked at his fields until harvest time? That is ridiculous! The farmer has to get out in his fields and sow the seeds. Does not God say in James 3:18 that "the fruit of righteousness are sown in peace by those who make peace"? The fruits of righteousness have to be sown! That is work.
What are the fruits of righteousness? They are love, joy, peace, gentleness, goodness, meekness, kindness, faith, self-control—but they have to be sown, fertilized, cultivated, and pruned. We see a process. As those fruits begin to be produced, sanctification cannot be hidden any more than the fruit on a tree can be hidden. We will never attain to holiness without Bible study, prayer, fasting, meditation, and obedience because through them is how spiritual life is sown, cultivated, fertilized, and tended so that fruit is produced.