Gee, that version (which wikipedia also links to) is very mangled. "Is not a patrons my lord" ?!
The letter concludes with:
Is not a Patron, my Lord, one who looks with unconcern on a man struggling for life in the water, and when he has reached ground, encumbers him with help? The notice which you have been pleased to take of my labours, had it been early, had been kind; but it has been delayed till I am indifferent, and cannot enjoy it; till I am solitary, and cannot impart it; till I am known, and do not want it. I hope it is no very cynical asperity not to confess obligations where no benefit has been received, or to be unwilling that the public should consider me as owing that to a Patron, which Providence has enabled me to do for myself.
Having carried on my work thus far, with so little obligations to any favourer of learning, I shall not be disappointed though I shall conclude it, if less be possible, with less; for I have been long wakened from that dream of hope, in which I once boasted myself with so much exultation,
My Lord,
Your lordship’s most humble,
Most obedient servant,
SAMUEL JOHNSON.
https://archive.org/details/beautiessamuelj00keargoog/page/n...