Larian Studios Forums Divinity - Original Sin Divinity Original Sin - Beta Difference between spells and skills ?

Unless I am mistaken: It is possible to cast a spell using a spell scroll, but not so for skills. A skill usually/sometimes has a certain requirement like a weapon equipped (such as a staff for the staff of magus). I guess for higher levels the APs needed for spells will be affected by a mage's intelligence but not the skills.