Sir John W. Salmond, Jurisprudence (1913)
“ Is it essential that a lease should be of less duration than the right which is subject to it? This is almost invariably the case; land is leased for a term of years or for life, but not in perpetuity; the owner of a thing owns it for ever, but the lessee of it possesses it for a time. We may be tempted, therefore, to regard this difference of duration as essential, and to define a lease as a right to the temporary exercise of a right vested in some one else. ”
