What does he want me to know? After John introduced his gospel, his encounter with the priests and Levites helps the reader to know that “among you stands One whom you do not know” (1:26; cf. 1:10), and that this ‘One’ is He who came after John (1:27), the One who is the Christ (1:20), the One who is the Lord (1:23).
Why does he want me to know that? John wants his readers to see (know) Jesus for His high and mighty nature (1:27); this same verse supports the claims John made in his introduction, where in verses 10, 12, and 14 he said the Word became flesh and dwelt among us (14), and yet the world did not know Him (10). Those who did not know Him could not receive Him if they had wanted to (12). Would the conclusion be wrong to say that if you do not know Him, you cannot receive Him even if you want to?
What am I to do? You must see (know) the capabilities of Jesus. (John saw Jesus, 1:29).
Why am I to do that? You must know His capabilities because He is able to take away the sin of the world (1:29, i.e. your sin).
What must I remember? You should always remember that John was witness to Jesus (1:19,29) and that was all he had to say for himself (1:22). He saw Jesus and knew that Jesus was the Lamb of God who takes away the sin of the world (1:29). John was not self-serving, and he elevated Jesus as the Savior…for you…for all.
The question(s) after all of this is, “Do you know the One who became flesh and dwelt among us?” Do you see Jesus through the testimony of John? Do you know that Jesus can take away your sin? Will you make the simple switch from sin to salvation through Jesus?