'What is that doctrine? It is that the moment you have a valid contract for sale the vendor becomes in equity a trustee for the purchaser of the estate sold, and the beneficial ownership passes to the purchaser, the vendor having a right to the purchase-money, a charge or lien on the estate for the security of that purchase-money, and a right to retain possession of the estate until the purchase-money is paid, in the absence of express contract as to the time of delivering possession.'
'that the vendor, whom I have called the trustee, was not a mere dormant trustee, he was a trustee having a personal and substantial interest in the property, a right to protect that interest, and an active right to assert that interest if anything should be done in derogation of it.'
'An unpaid vendor is a trustee in a qualified sense only, and is so only because he has made a contract which a Court of Equity will give effect to by transferring the property sold to the purchaser …'