“The meaning of life is to give life meaning.”

Source: Existentialism Is a Humanism (1946), p. 58

Not by Shakespeare, but from Finding Your Strength in Difficult Times: A Book of Meditations, a 1993 self-help book by David S. Viscott.
Misattributed
Source: http://quoteinvestigator.com/2014/06/16/purpose-gift/

Source: The Purpose Driven Life: What on Earth Am I Here for?

Troades (The Trojan Women), line 329; Translation by Emily Wilson
Tragedies

Man's Search for Ultimate Meaning (1997)
Context: It is true, Logotherapy, deals with the Logos; it deals with Meaning. Specifically I see Logotherapy in helping others to see meaning in life. But we cannot “give” meaning to the life of others. And if this is true of meaning per se, how much does it hold for Ultimate Meaning?

Section 75
The True Believer (1951), Part Three: United Action and Self-Sacrifice
Context: Passionate hatred can give meaning and purpose to an empty life. Thus people haunted by the purposelessness of their lives try to find a new content not only by dedicating themselves to a holy cause but also by nursing a fanatical grievance. A mass movement offers them unlimited opportunities for both.