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One counterclaim the separatists anticipate is A. True it was, that such atempts were not to be made and undertaken without good ground & reason; not rashly or lightly as many have done for curiositie or hope of gaine.
Such attempts of leaving and starting a new colony should not be made without reason, not for curiosity or gain. The author agrees, but he immediately explains that the risk is being undertook in the name of God.
Someone who puts a lot of effort immediately and then stops and loses interest later on is someone whose motivation typically drains pretty fast. People who fall for this cycle have often problems with their life because they cannot stick with anything over a longer time period.