Calling - How does God Call?

According to his purpose:

Romans 8:28

And we know that in all things God works for the good of those who love him, who have been called according to his purpose.

According to his grace:

2 Timothy 1:9

who has saved us and called us to a holy life—not because of anything we have done but because of his own purpose and grace. This grace was given us in Christ Jesus before the beginning of time,

Through Christ the Power of God:

1 Corinthians 1:24 

but to those whom God has called, both Jews and Greeks, Christ the power of God and the wisdom of God.

Through the Gospel:

2 Thessalonians 2:14 

He called you to this through our gospel, that you might share in the glory of our Lord Jesus Christ.

The Spirit and the Bride say, “Come”:

Revelation 22:17

The Spirit and the bride say, “Come!” And let him who hears say, “Come!” Whoever is thirsty, let him come; and whoever wishes, let him take the free gift of the water of life.