surrender

By thinking, He cannot be reduced to thought, even by thinking hundreds of thousands of times.
By remaining silent, inner silence is not obtained, even by remaining lovingly absorbed deep within.
The hunger of the hungry is not appeased, even by piling up loads of worldly goods.
Hundreds of thousands of clever tricks, but not even one of them will go along with you in the end. So how can you become truthful? And how can the veil of illusion be torn away?
O Nanak, it is written that you shall obey the Hukam of His Command, and walk in the Way of His Will.

-- from Guru Nanak Dev Ji's Japji Sahib (first page of Sri Guru Granth Sahib Ji)