My heart is inditing a good matter: I speak of the things which I have made touching the King: my tongue is the pen of a ready writer.
Thou art fairer than the children of men: grace is poured into Thy lips: therefore God hath blessed Thee for ever.
According to Strong’s numbers, the word inditing in Hebrew means to keep moving; to stir. So David is saying that his heart is moved about something good.
The introduction to this psalm would seem to indicate that it is a song of praise to some unnamed king in Israel. Some commentators believe it was for Solomon when he married the Princess of Egypt. Almost all agree that it also foresees the coming of the King of Kings, the Lord Jesus Christ, Who is fairer than all the fairest.
I especially love the statement, “My tongue is the pen of a ready writer.” Some point to this sentence as David claiming a special inspiration in writing this psalm. His heart was moved, stirred, full of something very good, and he was ready to sing this song of praise, perhaps knowing that his words would be preserved down through time.
Who else but Jesus is fairer than all the children of men? Who else has grace pouring from His lips? Who else can be said to be blessed by God forever? Lily of the Valley, bright and morning star, fairest of ten thousand.
I believe that when David sang this psalm, he was overwhelmed with the beauty, love, grace and majesty of the Lord.