This year has been full of joys and challenges. The future remains unknown. But I am so thankful for what this year has taught me about the faithfulness of God. I know God is faithful. It's not because I have seen Him move great mountains in my life, although He may do that at times. He's faithful because He is. He is Faithful. He is called Faithful and True (Revelation 19:11). He is Faithful and therefore He will not abandon me or be unfaithful, no matter where I end up.
2 Timothy 2:11-13 (ESV):
The saying is trustworthy, for:
If we have 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 completely understand this passage of scripture, but I am thankful for it. I don't have to understand it to believe it. But knowing that God is Faithful helps me understand it. If He calls Himself Faithful and True, if that's his very name, to be unfaithful would be to deny Who He is.
So what makes God faithful? The fact that He is Faithful. No other reason is needed.