In her demeanor and personal attire, she had conspicuously followed the vain fashions of the times; but now, humility, with a modest and retiring manner, marked her conduct; everything merely ornamental was discarded, and the softening, effect of a sanctifying principle imparted to the features of her face a sweetness which, impressing the beholder with a consciousness of the regenerating power that wrought within, was, to more than a few of her acquaintance, both arousing and instructive.

She changed her residence from Finsbury to the borough of Southwark, and settled near her friend Susanna Corder, with whom she united in the formation of a philanthropic association, "The Southwark Female Society for the relief of sickness and extreme want." The late Mary Sterry, and several other estimable members of Southwark meeting, together with benevolent individuals among the different religious denominations of the district, soon joined them, and the society became a highly influential channel through which assistance has been variously rendered to many thousands of the indigent poor; and it still continues, though with a reduced scale of operations, to be an important source of help to the sick and destitute.
Martha Savory devoted to this work of mercy much time and personal exertion; but a more important service was also designed for her.

She felt constrained to give evidence of her love to Christ by a public testimony to the grace which had been vouchsafed to her through Him who is "the way, the truth, and the life." Deep were the conflicts of spirit which she endured ere she could yield to this solemn requirement, but "sweet peace" was, she says, as she records the sacrifice, the result of thus acknowledging her gracious Lord.

"This step," she continues, "appears to me to involve the greatest of all possible mental reduction, but I reverently believe it was necessary for me, and mote, perhaps on my own account than on account of others; for, without this bond, and the necessary baptisms attending this vocation, I should have been in danger of turning back, and perhaps altogether losing the little spiritual life which has been mercifully raised." She adds a fervent petition for preservation and guidance, and that, by whatever means, however suffering to nature, the vessel might be purified, and fitted for the Master's use.
She first spoke as a minister in the year 1814.

The humiliation and brokenness of spirit which marked these weighty engagements, were felt by many, especially among her youthful friends, to be peculiarly impressive, as tokens of the soul-cleansing operations of omnipotent love, and as an awakening call to yield to the same regenerating influence.
She was acknowledged as a minister by Southwark Monthly Meeting, in the year 1818, when she had reached the age of 36; and in 1821, with the cordial approval of the meetings of which she was a member, she commenced that course of missionary labor in the gospel, to which she was subsequently so much devoted.