Now large crowds were traveling with him; and he turned and said to them, “Whoever comes to me and does not hate father and mother, wife and children, brothers and sisters, yes, and even life itself, cannot be my disciple. Whoever does not carry the cross and follow me cannot be my disciple. For which of you, intending to build a tower, does not first sit down and estimate the cost, to see whether he has enough to complete it? Otherwise, when he has laid a foundation and is not able to finish, all who see it will begin to ridicule him, saying, ‘This fellow began to build and was not able to finish.’ Or what king, going out to wage war against another king, will not sit down first and consider whether he is able with ten thousand to oppose the one who comes against him with twenty thousand? If he cannot, then, while the other is still far away, he sends a delegation and asks for the terms of peace. So therefore, none of you can become my disciple if you do not give up all your possessions. “Salt is good; but if salt has lost its taste, how can its saltiness be restored? (Luke 14:25-34, NRSV)
The gift of eternal life is a gift, it is true. And it is free to you, you can not earn it, but it can cost you.
You see to be a follower of Christ means to put Him first in your life, before everything else.
“Whoever does not hate mother and father, brothers and sisters, and even life itself can not come after me,” Jesus says.
You have to know what the cost is to follow Jesus, and that is everything.
But the life you will receive in return will be better than any you could make for yourself!