Constitutional law is a body of rules resulting from

the interpretation by a high court of cases in which

the validity, in relation to the constitutional

instrument, of some act of governmenthas been

challenged. (Bernas Commentary xxxviii)

Constitutional law is a term used to designate the

law embodied in the constitution and the legal

principles growing out of the interpretation and

application made by courts of the constitution in

specific cases. (Sinco, Phil. Political Law)

Constitutional law is the study of the maintenance

of the proper balance between authority

represented by the three inherent powers of the

State and liberty as guaranteed by the Bill of

Rights. (Cruz, Constitutional Law)

Constitutional law consist not only of the

constitution, but also of the cases decided by the

Supreme Court on constitutional grounds, i.e.,

every case where the ratio decidendi is based on a

constitutional provision. (Defensor-Santiago,

Constitutional Law)