I see people struggling with what lineage or tradition to choose from in Buddhism. There are debates about the superiority and appropriateness of different methods and teachings. I believe that the Mahayana is truly the Great Vehicle, the path of the bodhisattva, not limited by geographical, cultural or historic factors.
One of the Four Great Vows is: Dharma-gates are measureless, I vow to learn them. Or: I vow to learn all the teachings. A bodhisattva masters any and all methods. The specific teachings are always skilful means, that is, they are valid only within a specific context and appropriate for a limited number of people. The wisdom of the bodhisattvas, however, is universal.
So, if you want to liberate all beings and attain the supreme enlightenment there can be no teaching that is unworthy of your attention. There is no fixed method you should attach to besides bodhicitta itself."The Lord speaks of the 'great vehicle'. Surpassing the world with its Gods, beings and Asuras, such a vehicle goes forth. It is the same as space, and exceedingly great. As in space, so in this vehicle is room for immeasurable and incalculable beings. Such is this great vehicle of the Bodhisattvas, these great beings. One neither sees its coming, nor going, and its abiding as such, does not exist. Thus one cannot get at any beginning of this great vehicle, nor at any end, nor at any middle. Yet, such is self-identical everywhere. Thus, hereof one speaks of a 'great vehicle'."
(PP8000, ch. 1
)"A man or woman setting out on the Great Vehicle imbued with ten indefatigable determinations will enter the stage of realization of Thusness, to say nothing of the stage of enlightening beings. What are the ten? The indefatigable resolution to see, attend, and serve all buddhas; to build up all roots of goodness without retreating; to seek all truths; to practice all the transcendent ways of enlightening beings; to fully accomplish all concentrations of enlightening beings; to enter successively into all ages; to thoroughly purify all oceans of buddha-lands in the ten directions; to lead all realms of sentient beings to perfect development; to carry out the practices of enlightening beings in all lands and ages; to fully attain each power of buddhas by maturing all beings through the process of practicing as many transcendent ways as atoms in all buddha-lands to mature each being. Men or women with faith who are imbued with these ten indefatigable determinations grow in all roots of goodness, leave all compulsive, routine mundane tendencies, drop out of all social castes, go beyond all stages of individual emancipation, are born in the family of all buddhas, fulfill the vows of enlightening beings, become pure with the attainment of all qualities of the enlightened, become clarified in all the practices of enlightening beings, develop all the powers of buddhas, overcome all demons and challengers, progress through all the stages of enlightening beings, and reach buddhahood."
(Avatamsaka Sutra, ch. 39, p. 1171)