every stimuli by way of any of the senses cause feeling, seeing causes feeling, hearing causes feeling, smelling causes feeling, tasting causes feeling, and feeling causes feeling. and thought causes feeling, but all thoughts start from stimuli in the environment either of the body or outside of it. stimuli first, then feeling, then thought. thought does not start in a vacuum.
and what is feeling? it is the stimulation of the nerves of the body by way of contraction and relaxation of body components. everything from the inner world to the outer world causes a reaction of feeling.