What is the meaning of remoteness of vesting principle?

The interests of a beneficiary "vest in interest" when a trust is created. If a condition is placed on the beneficiary's entitlement then the interest becomes "contingent" instead of "vested". This may result in a problematic situation where the beneficiary's interests do not vest until after the perpetuity period. Thus, the remoteness of vesting principle is one in which a gift will be void if it might vest beyond the perpetuity period.