It's pretty plain, isn't it, oogi? Here's the Amplified version of it:
1[a]BLESSED (HAPPY, fortunate, prosperous, and enviable) is the man who walks and lives not in the counsel of the ungodly [following their advice, their plans and purposes], nor stands [submissive and inactive] in the path where sinners walk, nor sits down [to relax and rest] where the scornful [and the mockers] gather.
It makes the world envy the man who refuses to sit down with those who are not so blessed.
That is very true. Life is easier if you do not follow the advice of the ungodly or persistent sinner, especially when you are use to walking righteously, and wisely. Performing their advice is dreadful, when you already know a better way, so don't waste time even listening to them. It is better to not even submit to them. They will literaly destroy your life.