The mentality behind this skill is that you're tapping into the “collective consciousness” with mind, thus you can pull any skill from there.
Gain Skill: (Mind 2) The mage temporarily gains knowledge and use of a particular skill.
The caster gains temporary dots in a particular skill, chosen when the spell is cast, one skill dot per success, up to a max of the mage's Mind Arcanum Dots. Thus, a mage with Mind 3 can gain up to three dots in a skill using this spell. All the dots must be in the same skill, and skills cannot increase above 5 dots in this manner.
Bestow Skill: (Mind 3) The mage temporarily grants knowledge and use of a particular skill to another.
Works like gain skill, except the mage can cast it on others.
Skill Mastery: (Mind 4) The mage temporarily gains knowledge and use of one or more skills.
This spell works as gain skill except skills can exceed six dots, up to a max rating of the caster's gnosis, and successes from this spell can be split among multiple skills, rather than applied to only one.