20 “The one on whom seed was sown on the rocky places, this is the man who hears the word and immediately receives it with joy; 21 yet he has no firm root in himself, but is only temporary, and when affliction or persecution arises because of the word, immediately he falls away. 22 “And the one on whom seed was sown among the thorns, this is the man who hears the word, and the worry of the world and the deceitfulness of wealth choke the word, and it becomes unfruitful. Matt 13:20–22, NASB
The Bible very clearly teaches that Christians should examine themselves quite often in order to see what their spiritual condition is. Genuine Christians are not perfect people. Neither are they always full of happiness, in perfect health while having plenty of money in the bank. No, the fact that all believers are called to be humble, poor in spirit, meek, pure in heart and many other things that are growing in their character unto Christlikeness means that they will spend much of their time in the fires of sanctification.
It is during these times of pruning that believers are in the greatest danger of becoming despondent, discouraged, and even depressed if they have not learned to view their circumstances correctly.
Despite what many in the Easy-believism or Universalism camp teach, there are people who profess Christ who are not genuine. They are not regenerate nor do they have the Holy Spirit. They are not in Christ. All genuine Christians abide in Christ according to their new nature. They remain. They may go through the worst tribulation(s) imaginable, yet they remain attached to the Vine. However, when tribulation descends on the disingenuous professing Christians they do not endure because they have no root in themselves. The world and the deceitfulness of riches cause others to fall away. These are not genuine believers.