Cause v. object in contracts

Cause is the essential and impelling reason why a party assumes an obligation. Cause and object are different from each other.

As to remuneration, cause is the service or benefit which is remunerated while object is the thing which is given remuneration. 

As to donation, cause is the liberality of the donor or benefactor while object is the thing which is given or being donated. 

As to the thing, cause is the prestation or promise of a thing or service by the other while object is the thing or service itself. 

As to contracting parties, cause is different with respect to each part while object may be the same for both parties.