doubled by...addition grown: There are at least two major sources for theses statements. [6] The first is Shakespeare's allegorical poem, "The Phoenix and the Turtle," which itself derives from a number of literary traditions. Although critics disagree over its meaning, the general subject of the poem is the love and between two birds: the mythological phoenix and the turtle dove. The poem interweaves themes of love, death, and spirtual transcendence through a series of paradoxes and Neoplatonic language. [7] Consider, for instance, lines 25-28:

    So they lov'd, as love in twain
    Had the essence but in one;
    Two distincts, division none:
    Number there in love was slain. [8]

Two becomes one, and one, being divisible only by itself, is nothing. Mark Llewellyn views this paradox as a "resolute defiance of numerical logic in favour of spiritual completeness." Two subsequent stanzas (lines 37-44) carry this logic forward:

    Property was thus appall'd,
    That the self was not the same;
    Single nature's double name
    Neither two nor one was call'd.

    Reason, in itself confounded,
    Saw division grow together;
    To themselves yet either neither;
    Simple were so well compounded,

Llewellyn, speaking about Philips's verse, writes: "Here it is not sublimation so much as multiplication that is at work with the 'doubled' hearts strengthening rather than weakening individual identity."

The second and more immediate source of these lines is John Donne's love poem, "The Exstasie." Philips took the title "Friendship's Mysterys" from line 71, "Loves mysteries in soules doe grow," and the metrical and semantic parallels between the texts will be obvious to the reader: [9]

    But as all severall soules containe
    Mixture of things, they know not what,
    Love, these mixt soules, doth mixe againe,
    And makes both one, each this and that.

    A single violet transplant,
    The strength, the colour, and the size,
     (All which before was poore, and scant,)
    Redoubles still, and multiplies. (33-40).


Come, my Lucasia, since we see
    That miracles men's faith do move,
By wonder and by prodigy
    To the dull, angry world let's prove
    There's a religion in our Love.            5

For though we were design'd t'agree,
    That fate no liberty destroys,
But our election is as free
    As Angells, who with greedy choice
    Are yet determin'd to their Joys.         10

Our hearts are doubled by their loss,
    Here mixture is addition grown;
We both diffuse and both engross:
    And we, whose minds are so much one,
    Never, yet ever, are alone.

We court our own captivity,
    Then Thrones more great and innocent:
`Twere banishment to be set free,
    Since we weare fetters whose intent
    Not bondage is, but Ornament.           20

Divided Joys are tedious found,
    And griefs united easyer grow:
We are our selves but by rebound,
    And all our titles shuffled so,
    Both Princes, and both subjects too.

Our hearts are mutuall victims lay'd,
    While they (such power in friendship ly's)
Are Altars, Priests, and off'rings made,
And each heart which thus kindly dy's,
Grows deathless by the sacrifise.            30