What lessons can we learn about worship today based on these warnings and commands about worship in Old Testament times in Ecclesiastes 5:1-7?

The pain and agony the two sisters went through (Mary and Martha) in the death of Lazarus, does it mean sometimes God is happy to see us in pain just for His name to be glorified? I want more exposure on how to handle adversities of such nature.

Could you explain Ephesians 4:26,31. Can we as sinners be angry and not sin?

Does this teach loss of salvation?

Who is the King Lemuel mentioned in Proverbs 31 and who is his mother?

The people of the old testament who were saints, are they still in heaven, If God comes back for the second time for us, are we going to meet this people, or are they no more existing?

James 4:5 says, "Do ye think that the scripture saith in vain, The spirit that dwelleth in us lusteth to envy?". To what scripture is this reference pointing to? Is this a quote from the Old Testament or referring to something else in the New Testament?

I have a question/comment about the trinity. Can the trinity be explained as such...a man is a father, a son and a husband, i.e. one person with three distinct roles? Please give simple examples such as this followed by any pertinent scripture.

When a man dies, where does the spirit go? If the "spirit" of man is the one that gives the believer the knowledge of God, then does the "spirit" of an unbelieving man have knowledge of God?

Please define and explain the characteristics of the soul and the spirit of man.