The literal translation of this phrase is knowledge yoked together (as a team of horses to a wagon) with steadfastness.

What then does it mean to be steady in knowledge?

It means discovering the laws of the universe and allowing your heart, mind and body work in harmony with those laws.

At the physical level we discover the elements of creation, how planets orbit stars, how to engineer our modern world.

At the level of mind we discover everything we project outwards to those around us.

Finally, at the level of our heart we discover the source of the choices we make in our lives.