Paul explains that he, as an Apostle of the Lord does not act with craftiness or deceit. He explains that the Gospel of Jesus Christ is often blinded (veiled) from those who are perishing, from those who really need the Gospel.
Paul tells the Saints in Corinth that “…we preach not ourselves, but in Christ, Jesus the Lord…” (2 Corinthians 4:5) When we speak about the Gospel of Jesus Christ we need to remember that it is His Gospel, and we are only His servants. As Saints, we will be; “…troubled on every side, ye not distressed; we are perplexed, but not in despair; Persecuted, but not forsaken; cast down, but not destroyed…” (2 Corinthians 4:8-9) Paul explains that even with all the trials we have on this earth, it is never more than we can handle. We may see them as being the end, or may see them as being too hard for us to bear, but the Lord will guide us! The Lord God will raise us up, just as He was raised from the dead.
We need to; “…look not at the things which are seen, but at the things which are not seen: for the things which are seen are temporal; but the things which are not seen are eternal.” (2 Corinthians 4:18) While we are on this earth, we will not understand everything in its entirety. Science discovers new things daily, which should not be discredited. God created science and gives us the tools, thoughts and abilities to design, build, invent and discover the things that make our lives easier. Evolution is real, Creationism can coincide with science! After all, God created science! Paul just reminds us that the things we don’t see are the eternal things. Often times we are required to walk by faith and not by sight.