The commandment to lend money applies even if the borrower owns possessions that he can theoretically sell. Thus, the commandment to lend money, unlike the commandment to give charity, is intended to benefit not only the poor but also the rich.
If, at times, we are reluctant to lend money to someone who is not poor, we should consider the possibility that in a previous lifetime, the present roles may have been reversed: we may have been the beneficiary of a loan or some other form of help from the person presently requesting a loan from us. This is our opportunity to repay his good deed.1


To Tehila That's not precisely the case. Please see this link for an in-depth article on the sources on reincarnation within Torah
Thank you for this informative link which clarified an initial doubt I had.