Infirmities and Sins

What is the difference between infirmities and sins? Christ can be touched with the feeling of my infirmities, but He never had any sins, or any sympathy with them. I can get help for my infirmities, and in a sense can glory in them, but I could not in my sins.
There are two kinds of temptations. One is from without, all the difficulties of Christian life; Christ went through them and He has gone through more than any of us. But the other kind of temptation is when a man is drawn away of his own lust and enticed. Christ, of course, never had that.
You want the hatchet of Scripture for these latter; the Word of God discerns the thoughts and intents of the heart, and so helps us in that way to go through the wilderness.