You did know that Barclay’s Daily Study Bible was online, right? Barclay has his detractors, but his work is a great resource. Read his great quote here on 1 Timothy 2.4, below.
E. F. Brown calls this passage “the charter of missionary work.” He says that it is the proof that all men are capax dei, capable of receiving God. They may be lost, but they can be found; they may be ignorant, but they can be enlightened; they may be sinners, but they can be saved. George Wishart, the forerunner of John Knox, writes in his translation of the First Swiss Confession: “The end and intent of the Scripture is to declare that God is benevolent and friendly-minded to mankind; and that he hath declared that kindness in and through Jesus Christ, his only Son; the which kindness is received by faith.” That is why prayer must be made for all. God wants all men, and so, therefore, must his Church.