Albert Barnes Commentary Hebrews 13:6

"So that with good courage we say, The Lord is my helper; I will not fear: What shall man do unto me?" — Hebrews 13:6 (ASV)

So that we may boldly say. Without any hesitation or doubt. In all times of perplexity and threatening need; in all times when we scarcely know from where the supplies for our necessities are to come, we may put our trust in God and be assured that He will not leave us to suffer. In the events that occur under God's providential dealings, there is a basis for confidence on this subject, a confidence not always exercised even by good people. It remains yet to be shown that those who exercise simple trust in God for the supply of their wants are ever forsaken .

The Lord is my helper. Substantially this sentiment is found in Psalm 27:1 and Psalm 118:6. The apostle does not cite it as a quotation, but as language which a true Christian may employ. The sentiment is beautiful and full of consolation. What can we fear if we have the assurance that the Lord is on our side and that He will help us? Man can do no more to us than He permits, and of course no more than will be for our own good; and, under whatever trials we may be placed, we need not have any painful apprehensions, for God will be our Protector and our Friend.