Though he fall
Into temptation, and by it into sins, and these very great ones; from a lively and comfortable exercise of grace, and a degree of steadfastness in the doctrine of grace:
he shall not be utterly cast down;
because he is in the arms of everlasting love, and in the hands of Christ Jesus; is on him as the sure foundation, and is kept by the power of God through faith unto salvation, and so shall not perish, but have everlasting life;
for the Lord upholdeth [him with] his hand;
with the right hand of his righteousness, and keeps him from falling finally and totally; see ( Isaiah 41:10 ) ; and (See Gill on Psalms 37:17).