The best Quotations

Do you know the writers of the following quotations?

Quotation It is not well to make great changes in old age. - writer
Quotation A minority may be right, and a majority is always wrong. - writer
Quotation Setting a goal is not the main thing. It is deciding how you will go about achieving it and staying with that plan. - writer
Quotation There is not in the universe a more ridiculous, nor a more contemptible animal, than a proud clergyman. - writer
Quotation I believe that unarmed truth and unconditional love will have the final word in reality. That is why right, temporarily defeated, is stronger than evil triumphant. - writer
Quotation Perhaps nature is our best assurance of immortality. - writer