"Make a joyful shout to the LORD, all you lands!" (Psa. 100:1)
Friends, what kind of noise do you make when you are really surprised in a good way? Do you squeal or let out a glad shout? Worship is to be both joyful and universal ("all you lands" means all the people of Earth). There is no one whom God doesn't desire worship from. Everyone owes fealty to the true & living God. And how are we to worship today? The New Covenant contains the answer (cf. John 4:24).
"Serve the LORD with gladness; come before His presence with singing" (Psa. 100:2).
Why are we here on Earth? What is the purpose of life? Ecclesiastes 12:13 bears the answer: To fear God and keep His commandments is the entirety of man's duty. Serving God--with gladness, not drudgery--is man's all. Such must be a daily effort, not just on "special days" (however, we might define them). How do you serve God: with gladness, sadness, or madness? When we are serving God, do we ever give the impression that we'd rather be doing anything else? May it never be so! How we serve God matters; our attitude is important. Colossians 3:23 reads - "And whatever you do, do it heartily, as to the Lord and not to men."
"Know that the LORD, He is God; it is He who has made us, and not we ourselves; we are His people and the sheep of His pasture" (Psa. 100:3).
It is an undeniable fact that God made us, not vice versa. Life on Earth did not happen by chance and man cannot create life out of nothing. He cannot sustain life under his own power alone, but God can! He is the great Creator and Shepherd and we must humble ourselves as His creation--His sheep--listening to Him and following.
"Enter into His gates with thanksgiving, and into His courts with praise. Be thankful to Him, and bless His name" (Psa. 100:4).
God's temple is to be filled with praise, and where is God's temple today? God dwells in His children today, the church (cf. I Cor. 6:19,20)! Our lives should overflow with gratitude to Him. May we bless His name in word, thought, and deed perpetually! There is no better way to live.
"For the LORD is good; His mercy is everlasting, and His truth endures to all generations" (Psa. 100:5).
The closing verse provides more reasons to praise God: He is good, merciful, and true! He doesn't have to improve Himself; He is righteous and holy and awesome in every way! Followers of Christ, may we daily praise God for what He has done and for who He is.