A common enough sentiment. Of course what those who say this are afraid of is not what God is calling them to but change. As you know about the only people who like change are wet babies and even they cry about it. But think about it; what could God possibly call you to? If God is GOD and it is He that is truly calling you to something what are the only possible characteristics of that to which He is calling you? If it truly is of God it is only possible that it would be that which is:
If it is anything else it is not of God.
And if it is of God it can only, ultimately, bring you joy. You may have to pass through the fire first, but ultimately joy.
Are you afraid of holiness? Are you afraid of loving? Are you afraid of
Are you afraid of joy?
If you are afraid you are not afraid of these. You could not possibly be. You are afraid of leaving the known for the unknown. Satiation has killed many a sainthood. Has crushed joy. Has spoiled virtue. Has left too many people dissatisfied at best; ruined at worse.
“Be not afraid,” John Paul II told us. If it what God is calling you to then you have nothing to be afraid of except not accepting the call to change – not accepting joy.