There are lots of people killed, beat, put in jail, etc, etc, who are unsaved as well. They suffer, but not for the Gospel's sake. The mere fact that it happens to unbelievers doesn't negate that it CAN happen FOR THE GOSPEL'S SAKE.
Macular degeneration can be suffering for the Gospel's sake if it becomes testimony to draw unbelievers to Christ. An unbeliever who sees someone suffering an illness, someone bearing it, enduring it, nay, someone being cheerful in it, someone glorifying God in it will see the light of God, the difference in that person. {This is one possible way it can be for the Gospel's sake}
I don't believe that suffering for the Gospel is limited to mean the suffering was caused because we were preaching the Gospel, it can mean that we suffer in many ways which furthers the Gospel.
BTW... can someone please point me to the verse that says our suffering is "for the sake of the Gospel" ... I can't find it right now. Thanks.
Matthew 10:22
You will be hated by all because of My name, but it is the one who has endured to the end who will be saved.
Matthew 24:13
" But the one who endures to the end, he will be saved.
1 Corinthians 4:11-13
To this present hour we are both hungry and thirsty, and are poorly clothed, and are roughly treated, and are homeless; and we toil, working with our own hands; when we are reviled, we bless; when we are persecuted,
we endure; when we are slandered, we try to conciliate; we have become as the scum of the world, the dregs of all things, even until now.
1 Corinthians 13:4-6
Love is patient, love is kind and is not jealous; love does not brag and is not arrogant, does not act unbecomingly; it does not seek its own, is not provoked, does not take into account a wrong suffered, does not rejoice in unrighteousness, but rejoices with the truth; bears all things, believes all things, hopes all things,
endures all things.
1 Thessalonians 2:14
For you, brethren, became imitators of the churches of God in Christ Jesus that are in Judea, for you also
endured the same sufferings at the hands of your own countrymen, even as they did from the Jews...
2 Thessalonians 1:3-4
We ought always to give thanks to God for you, brethren, as is only fitting, because your faith is greatly enlarged, and the love of each one of you toward one another grows ever greater; therefore, we ourselves speak proudly of you among the churches of God for your perseverance and faith in the midst of all your persecutions and afflictions which you endure.
James 1:2-4
Consider it all joy, my brethren, when you encounter various trials,
knowing that the testing of your faith produces endurance. And let endurance have its perfect result, so that you may be perfect and complete, lacking in nothing.
2 Timothy 2:10-13
For this reason I
endure all things for the sake of those who are chosen, so that they also may obtain the salvation which is in Christ Jesus and with it eternal glory.
It is a trustworthy statement:
For if we died with Him, we will also live with Him;
If we endure, we will also reign with Him;
If we deny Him, He also will deny us;
If we are faithless, He remains faithful, for He cannot deny Himself.
I don't know about you, but I want to be an endurer.