In Luke 14:28-30 The Only Begotten Son of God said “For which of you, intending to build a tower, sitteth not down first, and counteth the cost, whether he have sufficient to finish it? Lest haply, after he hath laid the foundation, and is not able to finish it, all that behold it begin to mock him, Saying, This man began to build and was not able to finish.”

Can I call a few observations to mind? #1 “Christianity isn’t easy” or #2 “cheap”. Another good lesson to draw from this text for the student of the word of God would be #3 “Finish What You Started”.
I cannot stress enough what damage is done when professing Christians cave in and fall out. Many have I met who mock the Bible and insult Christianity and when you get to the bottom of it you often find that some Christian they trusted long ago, someone they loved quit and it robbed them of their hope! Time and again I’ve listened to the testimonies of those who at first appearance seem to hate Christians…someone who, as a child, watched their grandparents, or parents make a decision to follow Christ and then after some time they fell out, quit and their fall completely devastated someone who was watching to see if “it was real”. 
I wish I had space here to share with you just a few testimonies of some I’ve talked to over the years who said “No…I don’t want to hear about Christianity or Christ or God or Church…it wasn’t important to my parents and it isn’t important to me”. 
It is sad to think of those moms and dads who turned their own kids away from God by starting and then quitting. One man told me his father turned him away from Christianity by playing good Christian on Sunday and otherwise living like a hellion Mon-Saturday. “If that’s Christianity you can keep it”. 
Can I give you Christian parents, neighbors, grandparents, aunts, uncles, brothers and sisters some advice?! You are being watched and your walk is making an impact. Don’t quit! Don’t wobble on the axle! Get that Bible in its place every day; get that Christian life in its place every day! Put your feet on the floor saying “Lord…help me to honor you today lest I cause someone else to stumble and fall by my poor example”! If you’ve started on this Christian course of life – FINISH IT! If you’re a Christian, you’ve started a good thing, but a hard thing….So FINISH IT! Get serious about it before it is too late and you find yourself watching those who were watching you, headed to hell because you didn’t have the will and drive to dig in and go all the way! Don’t quit! Someone has to be willing to stand up for Jesus even if everyone else quits. Finish it! 
If you’ve already fell out; get up, brush off, and get going again!