"But his delight is in the law of the Lord, and on his law he meditates day and night. He is like a tree planted by streams of water, which yields its fruit in season and whose leaf does not wither. Whatever he does prospers." Ps. 1:2-3, NIV
But his delight - Christian are to be joyful people. We have joys, it is just that we do not take pleasure in sinful actions such as the ungodly do. The ungodly even twist words to make wrong seem good: sinfully delightful, Temptation [brand name], wicked [as a term of approval], etc. We have pleasure in good and wholesome things which bring no sorrow with them. God designed the world to be enjoyed and there are multitudes of pleasures available - the greatest of which is knowing God for yourself.
is in the law of the Lord, - So what does this godly person delight in? What is his/her foundation for life? The Law of God. Satan has twisted the perception of many Christians of the law of God. He is led them to think of it as bondage [it is bondage IF you are an evil doer] and Old Testament. He has told them to reject God's law and be "free" - sounds like his words to Eve in the Garden.
Or else Satan has led them into the opposite error of trying to keep the law in order to please God or earn salvation. Salvation is in Jesus Christ alone. No work of the law can ever save a person.
However, the law of God is to be a delight to the Christian. In it he discovers the character of the Person he loves. The law is a revelation of what God is like. It is also an instruction manual on how life works. We know, for example, that God designed marriage to be a life-long partnership between one man and one woman. This is how life works. Those who choose multiple sexual partners, live common law or engage in unnatural sexual acts may have a temporary humanistic pleasure, but they will not build long-term, solid lives and families for the glory of God. In every way the Law tells us what works and what doesn't. It should be our joy to get this "inside" information and build solid lives.
and on his law he meditates day and night. - The law of God is not simply some passing fancy of the Christian. It is not a hobby. It is his consuming passion as he continually develops his relationship with God. It is his foundation for life. Read the lives of great men and woman of God. They all had a love for the Bible, sometimes rising early in the morning to be able to study it before their busy days began. This is one of the purposes of our Feed Yourself course - to teach people how to study the Bible for themselves. A Christian who does not have a love for the Word of God - including the law - is a weak Christian or, perhaps a self-deluded person who only thinks they are a Christian.
He is like a tree planted by streams of water, - A tree planted by water is a strong, healthy tree. It can stand the storms of life. It can stand the blasts of the sun's rays without withering. A Christian who knows His God through continually drinking in the Word of God - even in the dry times - will be a strong person. He or she will be able to weather every opposition and still grow stronger in God. They will know, like Paul, what it is like to finish the race that is set before them.
which yields its fruit in season - Our relationship with God is not self-focused. As we grow in God, we have "fruit" at the right time to met the needs of others. Maybe they need a kind word, maybe they need a helping hand, maybe all they need is a good example to follow. Whatever their need we will have the right fruit for the right time because we are connected to the Living Water.
and whose leaf does not wither. - Delighting and meditating on the Word of God also keeps us alive and healthy even during the dry times. There is always the life of God flowing up our trunk and bursting out our leaves. No matter how busy our lives, every Christian needs to be in the word of God daily and thinking about it during the day. The world presents so many distractions that we must keep our eyes focused on what is important…more than important…vital.
Whatever he does prospers. - This life-giving relationship we have with God as we delight and meditate on His Word brings prosperity. In the West we tend to link prosperity with money. That is not the case. Prosperity is our entire life. It means knowing God, healthy relationships with others, a good mind, strong family, and much more. We cannot limit it to one area. Nor does this promise mean that our physical experience will always be prosperity. The natural course of love of and obedience to the Law of God is total prosperity and certainly it is spiritual prosperity. However, we are in a war and physically and mentally some aspects of our prosperity may be temporally hindered [plus that fact that none of us are 100% obedient] as we go through this world.