http://www.youtube.com/watch?v=RvNLkx9ndt0

"Nature's role is to help man, the crowning achievement of the evolutionary process, to realise the Divinity immanent in creation. Mountains help man to build houses by providing stone slabs, quarried from them. Trees provide the timber for constructing houses and also firewood for domestic use. Among animate beings, every creature, from an ant to an elephant, is of assistance to man in one way or another. Cows provide nourishing milk to man. Bollocks are useful for ploughing the fields and helping to grow food crops. All other creatures like birds, fish, sheep and other are serving man in their different ways. Seen in this light it will be clear that all things in creation are helpful to man in leading his life. Even the sun and the moon are serving man. The sages regarded the sun as an important deity and worshipped Him through the Gayatri Mantra. Thusman is deriving innumerable benefits from nature, and enjoying the amenities provided by naturein various ways. But what is the gratitude he is showing to nature? What gratitude is he offering to the Divine? He is forgetting the Divine who is the provider of everything. That is the reason for his becoming a prey to various difficulties and calamities. While he is receiving countless benefits from Providence, he is offering nothing in return to nature or God. This shows how unnatural and heartless is the behaviour of man. When we enjoined to return good for evil, how unbecoming is it to fail even to return good for good? Man is not learning the great lessons nature is teaching him. The foremost lesson is doing service with expectation of return.
Sathya Sai Baba

"Whatever learning one may acquire, whatever degrees one may flaunt, whatever power or position one may wield, whatever worship one may perform, one cannot achieve liberation unless one has deep Love of God. Cultivate that Love first. Love is everything. Truth and Love should be regarded as the two eyes of every person. If we have these two eyes, we can master the world.

"The secret of happiness is not in doing what one likes to do but in liking what one has to do. ...Within you is the real happiness. Within you is the mighty ocean of nectar divine. Seek it within you; feel it, feel it."
Sathya Sai Baba

Service to others is devotion to God.
"Service brings out all that is great in man. It broadens the heart and widens one's vision. It fills one with joy. It promotes unity. It proclaims the Truth of Spirit. It drives out all the evil qualities in man. It must be regarded as a great spiritual discipline. It is only when man is filled with the spirit of service that his Divine nature is revealed. He then experiences the 'peace that passeth understanding.'"
Sathya Sai Baba