"Utsāha" is a mental spirit (mānasī kriyā) which leads to promptness in every action.But, in "Amera Kosha" it occurs as a synonyme of "adhyavasāya" meaning Buddhi or intelligence, and "Mitākshara" explains "adhyavasāya" or "utsāha" – पुरुषार्थसाधन कर्म्मारम्भोऽध्यवसायः - as the effort or perseverance in the performance of acts accomplishing the objects of man.