Whatever I do---there is not one thing, spiritual or secular, that "whatever" doesn't cover.
"These words embrace all life." Ellicott
An action isn't qualified as being spiritual or non-spiritual. No act of life is.
"The quality of each act depends on the spirit which guides it, and the motive from which it springs. The commonest thing may be done in a high Christian spirit. The greatest deed may spring from a low and selfish motive. A religious act done in a secular spirit is secular. A secular thing done in a religious spirit is religious." Ellicott Commentary