Christ's Ascension: why wait 40 days?

Singing:
Hy 44 : 1,2,3
Hy 1
Ps 110 : 1–4
Ps 110 : 5,6
Ps 21 : 1,2
Hy 44 : 4,5

Reading:
John 21
Belgic Confession art. 37

Text:
Acts 1 : 1 – 14

Sermon:
Christ’s Ascension: why wait 40 days?

1. “Many proofs” were first needed
2. “God’s kingdom” had to be clear
3. The ascension itself had to be seen