The third out of the eightfold conduct pertaining to the Samyaktva (right faith);
absence of doubt about getting the reward of the sādhanā (spiritual practice).
vicikitsā-phalaṃ prati saṃdeho, yathā-kimiyataḥ kleśasya phalaṃ syāduta neti?....tadabhāvo nirvichikitsaṃ...
(U 28.31 SāVṛ Pa567)