Bukhari records on the authority of Abu Hurayrah that the Prophet (pbuh) said, 'Your actions alone will not save any of you.' They asked, 'Messenger of Allah, not even you?', He replied, 'Not even me, unless, Allah were to envelop me in His mercy. Be firm; steadfast and balanced; and journey [to Allah] in the beginning of the day, the end of the day, and a portion of the latter part of the night. Moderation, moderation! Through this you will attain your goal!"
He also recorded this hadith in another place with the wording, 'This religion is easy, none makes it hard upon himself except that it overwhelms him; therefore be firm, steadfast, and balanced; upon which have glad tidings! Seek help in this by journeying [to Allah] at the beginning of the day, at the end of the day, and a portion of the latter part of night.'