After Anne Locke, John Donne. Later, much later: Donne was a Puritan -- equally reformed -- but while Locke was a refugee from the Catholic Monarch of England, Donne was a functionary for the Commonwealth that replaced the monarchy under Cromwell.
His Holy Sonnets remain some of the best in English. Religious or secular.
Thou hast made me, and shall thy work decay?
Repair me now, for now mine end doth haste,
I run to death, and death meets me as fast,
And all my pleasures are like yesterday;
I dare not move my dim eyes any way,
Despair behind, and death before doth cast
Such terror, and my feeble flesh doth waste
By sin in it, which it t'wards hell doth weigh;
Only thou art above, and when towards thee
By thy leave I can look, I rise again;
But our old subtle foe so tempteth me,
That not one hour my self I can sustain;
Thy Grace may wing me to prevent his art,
And thou like Adamant draw mine iron heart.