On a spiritual level, pressure can be defined as an external force acting on us divided by our ability to bear the force or resist it. Thus, force and resistance capacity are two variants in the equation of pressure. Everyone has different resistance capacities. Two people with different resistance capacities will experience different amounts of pressure on being subjected to the same magnitude of a force. A feeling of pressure absorbs our freedom and gives us an experience of being ruled by an external entity.
There are a lot of people who hold the belief that they can experience freedom only in the absence of an external force, which is almost impossible, since there is always some force or the other exerted on the soul by ups and downs, that takes place in the role that it plays through the physical body; which includes the physical body itself; profession; family; wealth, all types of relationships, etc. Even our own personality, thoughts, feelings, emotions etc. exert pressure on us at times.