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Saunders (1782) 98 ER 1091 which reads as under:

Where a man is under a legal or equitable obligation to pay, the law implies a promise, though none was ever actually made. A fortiori, a legal or equitable duty is a sufficient consideration for an actual promise. Where a man is under a moral obligation, which no Court of Law or Equity can enforce, and promises, the honesty and rectitude of the thing is a consideration. As if a man promises, to pay a just debt, the recovery of which is barred by the Statute of Limitations; or, if a man, after he comes of age, promises to pay a meritorious debt contracted during his minority, but not for necessaries; or if a bankrupt, in affluent circumstances after his certificate, promises to pay the whole of his debts; or if a man promises to perform a secret trust, or a trust void for want of writing, by the Statute of Frauds. In such and many other instances, though the promise gives a compulsory remedy, where there was none before either in law or equity; yet as the promise is only to do what an honest man ought to do, the ties of conscience upon an upright mind are a sufficient consideration.