The steps of a good man are ordered by the Lord, and He delights in his way. Though he fall, he shall not be utterly cast down; for the Lord upholds him with His hand.
Notice the words "upholds him". Those who are righteous (in good standing with the Word of the King) know that when they fall, they are never left lying there. When they stumble, the King will never completely forsake them.
Those who truly love the Lord will keep His Word. it is impossible for you to fail if you keep His Word. Jesus made this statement: Jesus answered and said to him, “If anyone loves Me, he will keep My word; and My Father will love him, and We will come to him and make Our home with him. He who does not love Me does not keep My words; and the word which you hear is not Mine but the Father’s who sent Me. You can't get any clearer than that.
Psalms 37:23-24 John 14:23-24