For me personally, opportunity has been a significant factor. I've had the time to think about it clearly, and honestly, enough periods of boredom/lack of focus elsewhere to motivate me to do that.

I've also had the opportunity to experiment with left-leaning ideas personally and at length, and I got personally burned when those ideas did not have the effect I wanted them to have - that made me think deeply about what I had experienced and try and explain the disconnect between what I was expecting and what I experienced - it taught me that I was prone to error.

I credit the Holy Spirit ultimately - in leading me to understand - much against my inclination - who Christ actually is. This was probably the greatest barrier of all. Once I had been brought through my resistance to looking at Christ properly, and had opened myself up to seeing what was there rather than what I wanted to be there, I suppose I developed an understanding that it is possible for huge numbers of people to be decieved, and for the truth to be so cleverly mischaracterised that it is almost impossible to discern. Understanding how powerfully and collectively the culture is working to keep people looking everywhere but at Jesus is one huge wake-up call.

A love of truth?

A life-long instinctive rejection of anything that is dishonest?

A grudging acceptance of my own fallibility?

But if I had to say just one thing, I'm putting all the credit at the feet of the Holy Spirit. He has brought me home to the place I didn't even know I was looking for.