The four noble truths preached by Buddha are:-

(i) There is sorrow and suffering in the world.
(ii) The cause of sorrow and suffering is craving
(iii) Craving can be overcome
(iv) The way to overcome craving and attain nirvana is by following the eight fold path of
        (a) Right beliefs
        (b) Right speech
        (c) Conduct
        (d) Right means of livelihood
        (e) Right of mind
        (f) Right meditation
        (g) Right aspirations
        (h) Right effort.

Buddha prescribed the path of action as the way to adopt inculcate and practice the above eight precepts.