I have 2 passages of scripture which show the Lord's grace for the disabled.
Luke 16
19 There was a certain rich man, which was clothed in purple and fine linen, and fared sumptuously every day:
20 And there was a certain beggar named Lazarus, which was laid at his gate, full of sores,
now before we continue, do you have to pick up and carry an able bodied man and lay them at someone's gate?
No, Lazarus was disabled, he was obviously ill, having sores and ulcers.
Now continuing on
21 And desiring to be fed with the crumbs which fell from the rich man's table: moreover the dogs came and licked his sores.
22 And it came to pass, that the beggar died, and was carried by the angels into Abraham's bosom: the rich man also died, and was buried;
23 And in hell he lift up his eyes, being in torments, and seeth Abraham afar off, and Lazarus in his bosom.
24 And he cried and said, Father Abraham, have mercy on me, and send Lazarus, that he may dip the tip of his finger in water, and cool my tongue; for I am tormented in this flame.
25 But Abraham said, Son, remember that thou in thy lifetime receivedst thy good things, and likewise Lazarus evil things: but now he is comforted, and thou art tormented.
God didn't tell Lazarus (which is a name that means one whom God has helped) that he was worthless because he didn't work/couldn't work, God had him taken to a place of honor, next to the side of the patriarch of the Hebrew faith, where he was comforted.
Now, let's go back to the Old Testament for another. First off, let's remember, that God declared that King David was a man after His own heart. Now David was a sinner still, but there are certain elements of David's character, that show us a picture of God's character... a blurry picture, so if David was this compassionate, how much more so will God be?
2 Samuel 9
1 And David said, Is there yet any that is left of the house of Saul, that I may shew him kindness for Jonathan's sake?
2 And there was of the house of Saul a servant whose name was Ziba. And when they had called him unto David, the king said unto him, Art thou Ziba? And he said, Thy servant is he.
3 And the king said, Is there not yet any of the house of Saul, that I may shew the kindness of God unto him? And Ziba said unto the king, Jonathan hath yet a son, which is lame on his feet.
So there we go, David wants to show the kindness of God to a relative of the King who tried to have him hunted down and killed, for the sake of someone else. Total unmerited grace is what David wanted to show whoever this was. The servant points out that Jonathan's son is lame, that is, there is no way that Mephibosheth could ever repay the king for his kindness, in fact, as a descendent of King Saul who tried to kill David, Mephibosheth had every right to believe that David was going to execute him. Continuing on
5 Then king David sent, and fetched him out of the house of Machir, the son of Ammiel, from Lodebar.
6 Now when Mephibosheth, the son of Jonathan, the son of Saul, was come unto David, he fell on his face, and did reverence. And David said, Mephibosheth. And he answered, Behold thy servant!
7 And David said unto him, Fear not: for I will surely shew thee kindness for Jonathan thy father's sake, and will restore thee all the land of Saul thy father; and thou shalt eat bread at my table continually.
8 And he bowed himself, and said, What is thy servant, that thou shouldest look upon such a dead dog as I am?
9 Then the king called to Ziba, Saul's servant, and said unto him, I have given unto thy master's son all that pertained to Saul and to all his house.
10 Thou therefore, and thy sons, and thy servants, shall till the land for him, and thou shalt bring in the fruits, that thy master's son may have food to eat: but Mephibosheth thy master's son shall eat bread alway at my table. Now Ziba had fifteen sons and twenty servants.
11 Then said Ziba unto the king, According to all that my lord the king hath commanded his servant, so shall thy servant do. As for Mephibosheth, said the king, he shall eat at my table, as one of the king's sons.
12 And Mephibosheth had a young son, whose name was Micha. And all that dwelt in the house of Ziba were servants unto Mephibosheth.
13 So Mephibosheth dwelt in Jerusalem: for he did eat continually at the king's table; and was lame on both his feet.
Isn't this a beautiful picture of salvation?
a man who had no worth of himself, and unable to repay any favor because of his physical crippling, who could have been seen as a potential enemy of the King, shown kindness for the sake of another (as we are shown kindness for the sake of Jesus), is shown mercy, grace, and favor, as if he was one of David's sons (like the doctrine of adoption)
Totally unmerited grace, to show a picture of the kindness of God, to show the King's quality of character, and the quality of the God he served.