The Spirit is the One who initiates the movement and guides us towards this. This is where we discover the secret of Peter's sacrifice. We forsake everything. It is not important if what we forsake is small or great, but Christ becomes all in all. This is Sainthood.
Sainthood is more than ethical perfection or works of Christian virtues.
The latter comes as a result of a heart that loves much. One ought to give to Christ all one's love. This love does not entail deserting or abandoning any other lovers. When Christ is everything for us, then any other love that contradicts His love is rejected. Facing the love of Christ, all love of idols or selfishness is destroyed.