"So in a sense we could say that the practice of generating and cultivating the altruistic intention is so comprehensive that it contains the essential elements of all other spiritual practices." 
In Buddhism, we train in ethics, in concentration, and in wisdom. An aspect of wisdom is to see through our motives to discern whether we are acting out of altruism or veiled greed, in other words ethically or unethically. Concentration is the tool required for such penetrating insight.
As long as space endures,
As long as sentient beings remain,
Until then, may I too remain
And dispel the miseries of the world. 
It is the deepest, most important, part of our practice as Buddhists to generate this pure altruistic intention for every single thought we have, every single action we perform, every single word we say. We awaken in the morning with the intention to help all beings (note how this is not limited to humans!) in everything we do. We lie down to sleep, thankful for every moment during our day in which our thoughts, words, and actions were altruistically based, and repentant of every instance in which we acted out of greed, hatred, or delusion. There is no judgment, only sorrow over the harm we caused others by our noncompassionate action, and a further vow to dispel the sufferings of every single being with whom we come in contact. In the morning, we begin anew, vowing to base every moment of our lives on compassionate wisdom.
1-Minute Contemplation: Before you go to bed this evening, take 1 minute to contemplate your thoughts, words, and actions throughout the day. Were they based on compassion and love? Or were they based on your selfish ego? Maybe your intent seemed compassionate but a little probing reveals that it was simply veiled greed. See the harm you caused others through your egotistical acts and vow to base every action, every thought, on compassion and love. Leave a note for yourself so that in the morning, you remember to rededicate yourself to pure compassionate action in every moment of the day.
 Transforming the Mind. His Holiness the Dalai Lama. 2000.