1.
It cannot but happen?that those will survive whose functions happen to be most nearly in equilibrium with the modified aggregate of external forces? This survival of the fittest implies multiplication of the fittest.
Herbert Spencer
2.
Sometimes, it is an external force that makes you realize your real potential.
Arjun Kapoor
3.
When who you are and what you are is not decided by any external forces, then you are in dignity.
Jaggi Vasudev
4.
The organism cannot be regarded as simply the passive object of autonomous internal and external forces; it is also the subject of its own evolution.
Richard Levins
5.
There comes a point where the disappointments in your life accrue faster than you can find external forces to blame them on.
Christian Finnegan