Improve ourselves spiritually in order to reach the point of relaxation, so that we can enjoy what we are and what we have in any circumstances, and so that we can open our hearts and tolerate anything, and feel the God-nature in all beings, so that we don't look down upon anyone.
Spiritual practice helps us to improve our spirituality. It also helps us to reach the state of liberation achieved through one's own spiritual practice, when one gains the almighty power to deliver sentient beings, lacks nothing, and is able to give anything to sentient beings according to their needs.
(more: Spiritual practice: meditation practice or meditation exercise + precepts and discipline)
Self spiritual improvements help us to become a great being. A great being is one who has the demeanor, attainment, ability and wisdom to understand and realize things and reasons, and one who has the noble ideal of seeking liberation from birth and death, understanding the laws of the universe, and attaining the great wisdom and the Truth. Such is a great being.