How do we know Jesus will return?

In Mark 13:26-27, Jesus says, 'And then they will see the Son of Man coming in the clouds with great power and glory. And then He will send His angels and gather together His elect from the four winds.' This promises His second coming and the gathering of His elect, emphasizing that despite various tribulations and the passage of time, Christ's return remains certain. Additionally, passages like Matthew 24:30-31 affirm the visibility and authority of His return. His resurrection and ascension further confirm the truth of this promise, as expressed in Acts 1:11 where angels assured the disciples that He would return in the same way He was taken up to heaven.