How does a man have a "full" life? This is an interesting question because first you would have to get a definition of what a "full" life is - and then you might be able to answer this question. My own personal definition of a full life is one that remains full after death when we stand before God. I know many people who describe a full life - but often their definition rests on a fullness that is very temporary. Their fullness will go away - and often it will go away quickly. They will find that either their fullness will end after their pleasure runs its course and begins to cost on the back end - or it will become a glaring emptiness once they leave this life and stand in the presence of God giving account for why they considered what God calls empty - fullness.
God tells us how to have a "full" life. It is by being a man who understands the power of words - and uses them to build up - to encourage - to bless - rather than to kill, steal, and destroy. This man uses his words to bless because we read here that he is satisfied with good "by the fruit of his words." Every word he speaks is like a good seed - one that God approves and desires for us to speak. People are blessed and built up. They are glad that they have been in his presence to hear these encouraging and wonderful words. That is why he is blessed by them - because rather than his words coming back to haunt him - they are coming back to bless and reward him. Please do not misunderstand, this is not a "yes" man who only says what you want to hear. He is a man who speaks the truth - even when the initial reaction is negative. But he is not wanting a reward of the instant reaction of his words - he is wanting the "fruit" of them. It takes a while for fruit to develop. Thus he lives for the long-term affects of his words.
But there is more we learn here. This man also has the "deeds of his hands" return to him as well. These deeds are those that honor and glorify the Lord. They are deeds of kindness - and deeds which Jesus said would cause men to glorify God your Father when they experience them. Thus they are biblically blessed words - and biblically condoned deeds. How God wants us to have these kind of words and deeds be those that characterize our lives. How do we live a life that speaks these kind of words and does these kind of deeds? It is a life that turns to the Word of God for direction, for counsel, and for the words and deeds that is says and does. What does God call a good deed? Do that kind of deed. What does God say are good words to speak? Speak those kind of words. There really is no magic formula for a life that is blessed in the end. It is simply a life that turns to God's Word to define how life is lived - and how one's mouth is used.