Philippians 2:12-18
“Therefore, my beloved, as you have always obeyed, so now, not only as in my presence but much more in my absence, work out your own salvation with fear and trembling, 13 for it is God who works in you, both to will and to work for his good pleasure. 14 Do all things without grumbling or disputing, 15 that you may be blameless and innocent, children of God without blemish in the midst of a crooked and twisted generation, among whom you shine as lights in the world, 16 holding fast to the word of life, so that in the day of Christ I may be proud that I did not run in vain or labor in vain. 17 Even if I am to be poured out as a drink offering upon the sacrificial offering of your faith, I am glad and rejoice with you all. 18 Likewise you also should be glad and rejoice with me.”

1. Cooperate with God:

Philippians 2:12-13
“Therefore, my beloved, as you have always obeyed, so now, not only as in my presence but much more in my absence, work out your own salvation with fear and trembling, 13 for it is God who works in you, both to will and to work for his good pleasure.”

John 8:31-32
“So Jesus said to the Jews who had believed him, “If you abide in my word, you are truly my disciples, 32 and you will know the truth, and the truth will set you free.”

2. Cultivate godliness:

Philippians 2:14-16
“Do all things without grumbling or disputing, 15 that you may be blameless and innocent, children of God without blemish in the midst of a crooked and twisted generation, among whom you shine as lights in the world, 16 holding fast to the word of life, so that in the day of Christ I may be proud that I did not run in vain or labor in vain.”

3. Costly discipleship:

Philippians 2:17-18
“Even if I am to be poured out as a drink offering upon the sacrificial offering of your faith, I am glad and rejoice with you all. 18 Likewise you also should be glad and rejoice with me.”

Casual discipleship vs. Costly discipleship:

Casual:

“Apathy and complacency are hydra-headed sins which are an affront to God Almighty … The severest sin of Christians is a numbing lack of concern, an anesthetized attitude of ‘I don’t care. I’m in the fold. Why should I concern myself? I have a fire insurance policy against hell.’ Apathy, complacency, indifference, spiritual drowsiness and insensitivity are lulling the church of the Lord Jesus Christ to sleep.”
–Charles Stanley

Costly:
“The messengers of Jesus will be hated to the end of time. They will be blamed for all the division which rend cities and homes. Jesus and his disciples will be condemned on all sides for undermining family life, and for leading the nation astray; they will be called crazy fanatics and disturbers of the peace. The disciples will be sorely tempted to desert their Lord. But the end is also near, and they must hold on and persevere until it comes. Only he will be blessed who remains loyal to Jesus and his word until the end.”
―Dietrich Bonhoeffer

Luke 14:28
“For which of you, desiring to build a tower, does not first sit down and count the cost, whether he has enough to complete it?”