The excellency of holy courage in evil times by Jeremiah Burroughs

Fourthly, As grace is mixed at first, so sometimes it is weak, the parts and members not being consolidated, and strengthened: when an infant comes first into the world if you expose it to the cold it is not able to endure it, which afterward it will do, when the Joints are set, and so young plants cannot endure that frost, which they will do afterwards: And so Christians at first are as children, carried away with every wind of doctrine, till afterward they come to be more strong, and then they are fit for service. As Christ would not have his disciples ⟨p. 107⟩called to fasting and praying, they were hard duties while they were weak, he hath this expression; no man puts new wine into old bottles, nor sow a new piece of cloth into an old Garment, for the bottles will break and the garment will rend, in Math, 9.16.17. The meaning is do not bring unsureable duties to mens spirits; fasting and prayer is a duty but they are not strong enough for it yet, noting when people grow strong they shall be fitter for duty, service, or suffering.

Fourthly, As grace is mixt at first, so somtimes it is weak, the parts and members not being consolidated, and strengthened: when an infant comes first into the world if you expose it to the cold it is not able to endure it, which afterward it wil do, when the Joynts are set, and so young plants cannot endure that frost, which they wil do afterwards: And so Christians at first are as children, carryed away with every wind of doctrine, til afterward they come to be more strong, and then they are fit for service. As Christ would not have his disciples ⟨p. 107⟩