"And by reason of the exceeding greatness of the revelations, that I should not be exalted overmuch, there was given to me a thorn in the flesh, a messenger of Satan to buffet me, that I should not be exalted overmuch." 2 Corinthians 12:7
Most Christians and many non-Christians are familiar with the plight of Paul's thorn in the flesh. He attributes it to having visited heaven and witnessed things too amazing to describe. He then specifically states that the discomfort he was given (not a literal thorn in literal flesh) was given, for all intents and purposes, to keep him humble.
Beloved there are at least two messages here. To the Christian, the benefits of a relationship with God should be obvious. In fact, it would exceed the available space to even try to list them all, however, this would be a great place to pause and give quiet thought to how good God has been to you throughout your lifetime. That done, none of us have to look far to see those who have been so blessed by God that they think they have accomplished and acquired everything in and of themselves and therefore do not need God. These folks have missed the point entirely. In situations like this, it would be better to have some sort of reminder of both the hierarchy associated with our very existence and the source of every blessing than to lose sight of both because of His overwhelming goodness. One might think, "Why does such a reminder necessarily involve pain?" We should not assume that Paul's malady involved pain, however we know that whatever it was not only kept him in line but served as an example to others and glorified God. Have you ever been inspired by the faith of someone less fortunate than you?
To the non-Christian considering membership in God's family, it should be known that it is not all cookies and cream. God never promised us an easy row to hoe. In fact, there is full disclosure given regarding the difficulties that can be expected from faithfully living the Christian life. Our purpose in life is to glorify Him through our praise, worship, love, obedience and sharing with others. In so doing, we may become scuffed or inconvenienced, but the benefits of being a child of God are beyond imagination and eternal. Paul experienced the highest highs and the lowest lows, but learned ultimately to depend on God for everything and accept His will in all things. That is the purpose of the thorn.