Paul's Thorn and God's Grace

2 Corinthians 12:7

7 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.
8 Concerning this thing I besought the Lord thrice, that it might depart from me.
9 And he hath said unto me, My grace is sufficient for thee: for my power is made perfect in weakness. Most gladly therefore will I rather glory in my weaknesses, that the power of Christ may rest upon me.
10 Wherefore I take pleasure in weaknesses, in injuries, in necessities, in persecutions, in distresses, for Christ's sake: for when I am weak, then am I strong.

Here it is used the Greek word skolops and not astheneia. This is not related to sickness. 
Used only in 2 Cor 12:7.

Thorn - Greek: skolops

Strong's Concordance - 4647

skolops: anything pointed, spec. a stake, thorn
Original Word: σκόλοψ, οπος, ὁ
Part of Speech: Noun, Masculine
Transliteration: skolops
Phonetic Spelling: (skol'-ops)
Short Definition: a stake or thorn
Definition: a stake or thorn; fig: a sharp affliction.

4647 skólops – properly, anything with a sharp point, a thorn; (figuratively) an instrument producing pain, discomfort (acute irritation), used only in 2 Cor 12:7.

Unbelief - Jesus Rejected at Nazareth
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Jesus paid for ALL my sin and diseases, and there is NOTHING I can add to that. It's a FREE gift.

But if I want the blessing, power and healing flowing through MY LIFE from God, there is a price I must pay. But compare with not having it, it's a LIGHT BURDEN.

Take My yoke upon you and learn from Me; for I am gentle and humble in heart, and you will find rest for your souls. For My yoke is easy and My burden is light.” Matthew 11:29-30