"Wherefore he is able also to save them to the uttermost that come unto God by him, seeing he ever liveth to make intercession for them." (Hebrews 7:25)
He is able - that simply means that Christ alone is able to save. Not a minister, not a church, not an ordinance, nor a religious ritual can save. Only the Lord Jesus Christ is able to save a soul. There was a time when I relied on my religious works for salvation. I thought I had to do things in order to gain points with God. It was pitiful. One day, I was doing good (at least I thought that way in my mind); the next day, I was miserable because of sin. But when I finally came to the point where I realized that Christ was all I needed, that His work on the cross was the only work that could pay for my sins, then I rested in the fact that Christ alone was able to save. Not my works, but His work saves. Not my merits, but His merits gained salvation. Indeed, He alone is able.