Third, do not be too greedy. Most people have a misunderstanding about Buddhism and assume that Buddhism refutes all forms of desire and physical pleasures. This is not the case. The Buddha also acknowledged that, to a certain extent, desire is a driving force. For instance, the fervent wish to study the Buddhist teachings, to become Buddha, and to benefit sentient beings all constitute desire. Without this desire, one would lose the impetus to study the teachings. Thus, on the whole, the Buddha did not oppose desire. The Buddha said: ordinary people cannot do or survive without desire; they drink when they are thirsty and eat when they are hungry. However, when desire becomes excessive, it leads to consequences we do not wish to see — suffering, disappointment, hopelessness, etc.
~Depicted from ARE YOU READY FOR HAPPINESS - The Tibetan Buddhist View on Happiness