We take refuge in Buddha as our ultimate destination. In doing so, we confirm our potential. If we did not possess the potential to become free and liberated from suffering, then it would be useless, impossible, and foolish to try to become liberated. Since we are all Buddha by nature, however, every one of us possesses the potential for liberation, freedom, and enlightenment. That is quite clear.
Nothing is good enough for sentient beings except ultimate limitless liberation.
I am one hundred percent convinced that sentient beings will not stop in their search for happiness. They will wander in samsara forever until they finally become fully enlightened. After receiving refuge, we must be able to maintain this transmission, which we do by taking a vow to remind ourselves of our commitment to follow the Buddha, the Dharma, and the Sangha. The vow we take for the Buddha is that we will always be intent upon liberating and enlightening our potential. The vow we take for the Dharma is that we will do our best to avoid anything that is harmful or negative to ourselves and to others.