Sikh philosophy - Underlying values (Wikipedia)

The Sikhs must believe in the following values:

1. Equality: All humans are equal before God – No discrimination is allowed on the basis of caste, race, gender, creed, origin, color, education, status, wealth, et cetera. The principles of universal equality and brotherhood are important pillars of Sikhism.
2. Personal right: Every person has a right to life but this right is restricted and has attached certain duties – simple living is essential. A Sikh is expected to rise early, meditate and pray, consume simple food, perform an honest day's work, carry out duties for his or her family, enjoy life and always be positive, be charitable and support the needy, et cetera.
3. Actions count: Salvation is obtained by one’s actions^{[citation needed]} – good deeds, remembrance of God – Naam Simran, Kirtan.
4. Living a family life: Encouraged to live as a family unit to provide and nurture children for the perpetual benefit of creation (as opposed to sannyasa or living as a monk, which was, and remains, a common spiritual practice in India.)
5. Sharing: It is encouraged to share and give to charity 10 percent of one’s net earnings.
6. Accept God’s will: Develop your personality so that you recognise happy events and miserable events as one – the will of God causes them.
7. The four truths of life: Truth, contentment, contemplation and Naam (in the name of God).

Source: http://en.wikipedia.org/wiki/Sikh_philosophy

Guru Nanak - Teaching (Wikipedia)

Nanak’s teachings can be found in the Sikh scripture Guru Granth Sahib, as a vast collection of revelatory verses recorded in Gurmukhi.

From these some common principles seem discernible. Firstly a supreme Godhead who although incomprehensible, manifests in all major religions, the Singular "Doer" and formless. It is described as the indestructible (undying) form.

Nanak describes the dangers of egotism (haumai- "I am") and calls upon devotees to engage in worship through the word of God. Naam, implies God, the Reality, mystical word or formula to recite or meditate upon (shabad in Gurbani), divine order (hukam) and at places divine teacher (guru) and guru’s instructions)^[21] and singing of God’s qualities, discarding doubt in the process. However, such worship must be selfless (sewa). The word of God, cleanses the individual to make such worship possible. This is related to the revelation that God is the Doer and without God there is no other. Nanak warned against hypocrisy and falsehood saying that these are pervasive in humanity and that religious actions can also be in vain. It may also be said that ascetic practices are disfavoured by Nanak, who suggests remaining inwardly detached whilst living as a householder.

Through popular tradition, Nanak’s teaching is understood to be practised in three ways:

• Vaṇḍ Chakkō: Sharing with others, helping those with less who are in need
• Kirat Karō: Earning/making a living honestly, without exploitation or fraud
• Naam Japna: Meditating on God's name to control your 5 evils to eliminate suffering and live a happy life.

Nanak put the greatest emphasis on the worship of the Word of God (Naam Japna).^[21] One should follow the direction of awakened individuals (Gurmukh or God willed) rather than the mind (state of Manmukh- being led by self will)- the latter being perilous and leading only to frustration.

Reforms that occurred in the institution and both Godhead and Devotion, are seen as transcending any religious consideration or divide, as God is not separate from any individual.

Source: http://en.wikipedia.org/wiki/Guru_Nanak#Teachings