Mark 13:26-27 (KJV)  And then shall they see the Son of man coming in the clouds with great power and glory.
  27 And then shall he send his angels, and shall gather together his elect from the four winds, from the uttermost part of the earth to the uttermost part of heaven.

The gathering of the church to glory is the thought of these verses. It will be during the time when the Son of man be seen coming in the clouds with great power and glory.

He shall gather His elect from the four winds and from the uttermost part of the earth to the uttermost part of heaven. What a gathering!

1 John 3:2 (KJV)  Beloved, now are we the sons of God, and it doth not yet appear what we shall be: but we know that, when he shall appear, we shall be like him; for we shall see him as he is. Amen.