Luke 14:28

28 If one of you is planning to build a tower, you sit down first and figure out what it will cost, to see if you have enough money to finish the job.

Luke 14:28 In-Context

26 "Those who come to me cannot be my disciples unless they love me more than they love father and mother, wife and children, brothers and sisters, and themselves as well.
27 Those who do not carry their own cross and come after me cannot be my disciples.
28 If one of you is planning to build a tower, you sit down first and figure out what it will cost, to see if you have enough money to finish the job.
29 If you don't, you will not be able to finish the tower after laying the foundation; and all who see what happened will make fun of you.
30 "You began to build but can't finish the job!' they will say.
Scripture taken from the Good News Translation - Second Edition, Copyright 1992 by American Bible Society. Used by Permission.