Yea, let none that wait on thee be ashamed - To “wait on the Lord” is an expression denoting true piety, as indicating our dependence on him, and as implying that we look to Him for the command that is to regulate our conduct and for the grace needful to protect and save us. Compare Isaiah 40:31. See also Isaiah 8:17; Isaiah 30:18; Psalms 40:1; Psalms 69:3. This petition is indicative of the wish of the pious heart that none who profess to serve God may ever be put to shame; that they may never be overcome by sin; that they may never fall under the power of temptation; that they may not fail of eternal salvation.
Let them be ashamed which transgress without cause - This does not imply that any sinners transgress otherwise than without cause, or that they have any good reason for sinning; but it brings into view a prominent thought in regard to sin, that it is without cause. If the wicked had any good reason for their course of life - if they were compelled to do wrong - if the temptations under which they act were so powerful that they could not resist them - if they were not voluntary in their transgressions - then true benevolence would demand of us the prayer that they might not be confounded or put to shame. However, since none of these circumstances occur in the case of the sinner, there is no lack of benevolence in praying that all the workers of evil may be put to confusion; that is, that they may not triumph in an evil course, but that their plans may be defeated, and that they may be arrested in their career. There is no benevolence in desiring the triumph of wickedness; there is no lack of benevolence in praying that all the plans of wicked men may be confounded, and all the purposes of evil be frustrated. True benevolence requires us to pray that all their plans may be arrested, and that the sinner may not be successful in his career. A person may be certain that he is acting out the principles of benevolence when he endeavors to prevent the consummation of the plans and the desires of the wicked.