Lest haply, after he hath laid the foundation, and is not able to finish it, all that behold it begin to mock him,

Lest haply, when he hath laid a foundation, and is not able to finish, all that behold begin to mock him,

Lest, after he hath laid the foundation, and is not able ti finish it, all that see it begin to mock him,

in order that, having laid the foundation of it, and not being able to finish it, all who see it do not begin to mock at him,

Lest perhaps after he hath laid the foundation, and is not able to finish it, all that behold it begin to mock him,

lest that he having laid a foundation, and not being able to finish, all who are beholding may begin to mock him,

lest perhaps, when he has laid the foundation and is unable to finish, all who see it shall begin to jeer at him,

For fear that if he makes a start and is not able to go on with it to the end, all who see it will be laughing at him,

Otherwise, after he will have laid the foundation and not been able to finish it, everyone who sees it may begin to mock him,

Otherwise, if you have laid the foundation and are not able to finish it, everyone who sees it will laugh at you,

Haply - Perhaps.
To mock him - To ridicule him. To laugh at him.

Lest haply after he hath laid the foundation,.... Has begun to build, has taken up a profession, has submitted to ordinances, and got into a church state:
and is not able to finish it; a foundation may be laid, and the building may never be finished, because the foundation is not laid right; was it, it would continue, and the building go on, and at last be finished; though no man is able to finish it of himself, yet those hands which have laid the foundation, will raise up the superstructure, and complete the whole building, through the power and efficacy of divine grace: but where there is a beginning, and which at first looks well, and there is no progress, but the work is dropped and left unfinished,
all that behold it, begin to mock; as follows;