O! how thy worth with manners may I sing,
When thou art all the better part of me?
What can mine own praise to mine own self bring?
And what is't but mine own when I praise thee?
Even for this, let us divided live,
And our dear love lose name of single one,
That by this separation I may give
That due to thee which thou deserv'st alone.
O absence! what a torment wouldst thou prove,
Were it not thy sour leisure gave sweet leave,
To entertain the time with thoughts of love,
Which time and thoughts so sweetly doth deceive,
And that thou teachest how to make one twain,
By praising him here who doth hence remain.
There is another  paradox . “Time and thoughts” — abstracts again — “doth deceive” love. This is complicated. Shakespeare is saying that time to think and thought itself can affect our perception of love. Here they have an enhancing effect, hence “so sweetly”. 
 Note that two abstract ideas, time and thought, are  personified , in that they “deceive”.
Sonnet 39