luke 14:28 For which of you, intending to build a tower, sitteth not down first, and counteth the cost, whether he have sufficient to finish it? - Free Bible Online

      28-33. which of you, &c.--Common sense teaches men not to begin any costly work without first seeing that they have wherewithal to finish. And he who does otherwise exposes himself to general ridicule. Nor will any wise potentate enter on a war with any hostile power without first seeing to it that, despite formidable odds (two to one), he be able to stand his ground; and if he has no hope of this, he will feel that nothing remains for him but to make the best terms he can. Even so, says our Lord, "in the warfare you will each have to wage as My disciples, despise not your enemy's strength, for the odds are all against you; and you had better see to it that, despite every disadvantage, you still have wherewithal to hold out and win the day, or else not begin at all, and make the best you can in such awful circumstances." In this simple sense of the parable (STIER, ALFORD, &c., go wide of the mark here in making the enemy to be God, because of the "conditions of peace," Lu 14:32), two things are taught: (1) Better not begin (Re 3:15), than begin and not finish. (2) Though the contest for salvation be on our part an awfully unequal one, the human will, in the exercise of that "faith which overcometh the world" (1Jo 5:4), and nerved by power from above, which "out of weakness makes it strong" (Heb 11:34; 1Pe 1:5), becomes heroical and will come off "more than conqueror." But without absolute surrender of self the contest is hopeless (Lu 14:33).

JFB.