8:22-26 What was Jesus' purpose in taking the blind man outside the town, and why did He spit on his eyes?

Scriptures do not record the answer to either of these questions, thus anything ventured here would be pure speculation.

This is the only record in scripture of Jesus healing someone in two stages, and it should encourage us to persevere the same as He did if complete healing does not manifest immediately in whomever we are believing it for.

When complete healing did not manifest in the blind man immediately, Jesus kept challenging him until it did. Where it says in V23 that Jesus asked the man if he saw anything, this means in the literal English rendering of the Greek that Jesus kept asking the man, "Do you, possibly, see anything?"

When the man said that he saw men as trees walking around, Jesus laid His hands on him again and made him look up until his sight was completely restored, and he could see clearly.

The way Jesus continued with the healing process until the man was completely healed is recorded here for our example, and we must be prepared to persevere likewise.