With senses brought sufficiently under self-control, hence freed from the grip of attraction and repulsion, he who deals with world objects with self-restraint, attains placidity.
With all this said, is there any cause for undue alarm? No, says Krishna. That is why he enlightens and cautions the seekers, empowering them to grow inwardly and gain elegance and mastery in dealing with life.
Mind employs the senses, enabling them to perceive and interact with objects. Rāga and dveṣa (like and dislike) are two psychological urges the mind generates. Knowing this well, be watchful to sublimate them constantly, avoiding all possible slips and errors.
Let senses interact with objects, but in the process attraction and repulsion should not overpower the mind. As to sukha-duḥkhas, be even-minded to rāga-dveṣas too.
Sensory interactions can bring sukha or duḥkha alone. Why then foster undue attraction or repulsion at all? When moderation and evenness adorn the mind, it will generate placidity, which the mind cherishes and yearns to preserve!