He felt and sympathized wherever humanity could be interested.
He wrote to the judges on the subject of capital punishments, warning them not to take away the lives of persons for theft.

On the coast of Cornwall he was deeply distressed at finding the inhabitants, more intent upon plundering the wrecks of vessels that were driven upon their shores, than upon saving the poor and miserable mariners, who were clinging to them; and he bore his public testimony against this practice, by sending letters to all the clergymen and magistrates in the parishes, bordering upon the sea, and reproving them for their unchristian conduct In the West-Indies also he exhorted those, who attended his meetings to be merciful to their slaves, and to give them their freedom in due time.

He considered these as belonging to their families, and that religious instruction was due to these, as the branches of them, for whom one day or other they would be required to give a solemn account.

Happy had it been, if these christian exhortations had been attended to, or if those families only, whom he thus seriously addressed, had continued to be true Quakers; for they would have set an example, which would have proved to the rest of the islanders, and the world at large, that the impolicy is not less than the wickedness of oppression.

Thus was George Fox probably the first person, who publicly declared against this species of slavery.