And that's the most significant of the 4 legs of the 4 legged stool there.
No. Scripture is the most significant, but without experience we would be talking about using a three-legged stool, that's what is significant about the fourth leg.
Let me illustrate with an instance from my church's life:
I was talking to a parishoner yesterday who doubted her salvation. The reason, she felt like she had blasphemed against the Holy Spirit, and as she read scripture and had recalled hearing other sermons in other churches, she understood that anyone who did that was beyond the reach of salvation for they had done something unforgiveable.
Well, I tried to share with her how I didn't think that the verse applied to her experience. (There is that key word.) But she was still stuck where she was, and feeling (which is also an experiential term) lost. Well, while we were visiting several others stopped by. There was a friend who was able to identify with some of her lostness. Another preacher in town (a free Methodist, i.e. of Wesleyan theology) came by, and I just simply asked him for his understanding of that verse, and he affirmed what I had already said, that God never rejects those who are open to him in their lives. But what seemed to make the difference was not Scripture, generations of church tradition (and teaching), or any amoung of reason. What made the difference was when I shared some of Marycita's story. (Hope you don't mind, Mary.)
The story of another person's experience helped her see that God would not only accept back, but gracious welcome with open arms, those who loved him regardless the past. She had spent years under the other understanding (which I think is a a misapplication of that particular scripture), but just one simply story, a story that was based in another person's lifestory of experiencing God's grace, relieved her of all her anxiety like nothing else was able to do. And that is why we Welseyans include experience as one of the legs of our stool, because in practical ways it helps us to get it right when we don't understand properly from using some other sort of stool.