Hi this is part of Shakespeare's dedication of his work The Rape of Lucrece(1594) to Lord Southampton who was one of his patrons
"The love I dedicate to your lordship is without end ... What I have done is yours; what I have to do is yours; being part in all I have, devoted yours." Lord Southampton on one occasion gave Shakespeare a present of £1000 to complete a purchase. There is no documentary evidence of this however.