To not seek pleasure for its own sake: I believe this applies specifically to pleasure as sensual gratification, gratification of the senses in and of themselves and frivolous amusement. I do not believe it is meant to prohibit seeking joy.
To not scheme for pleasure:
"Scheme" has the meaning of subterfuge. Of concealed and covert maneuvering or plotting. It has an aspect of taking somebody by surprise, even by deception. There is even an element of conquering, as a commander in the military might maneuver to catch an enemy by surprise or at a disadvantage.
How this might apply to pleasure seeking:
With each of the above pairs of opposites the positive pole is enhanced by the presence of its opposite.
It is said that to appreciate or to perceive anything sensory we need to have experienced its opposite or its absence.
Bitterness in pleasure and the denial of pleasure are forms of pleasure. Pain and abstinence, have in human experience been encouraged or sought in the realm of pleasure or thinking about it. We know there are people who experience pleasure by self-denial or pain and suffering.
These are extreme cases and are to be avoided, as should the indulgence of desires for gratification.
How to integrate these 3 statements: Do not seek sexual or other frivolous pleasures for themselves or preoccupy oneself with their absence. Do not look to another solely as a source of pleasure or a tool for such. To do so degrades the hunter as well as the prey. Pleasure is a bi-product of living well. It is not something to be sought in itself or put above any other thing. Pleasure does not advertise itself. And what may be advertised as pleasure may be altogether different. Recognize that pleasure comes in many guises, and can be found masquerading in all things.
