One Dimensional

If your only tool is a hammer,
you tend to see every problem as a nail.
- Abraham Maslow

Thaw with her gentle persuasion is more powerful
than Thor with his hammer.
The one melts, the other breaks into pieces.
- Henry David Thoreau

If at first you don't succeed, get a bigger hammer.
- Alan Lewis
[Sometimes a bigger hammer works, but it isn't a very creative approach.]

Insanity is doing the same thing, over and over again,
but expecting different results.
- Rita Mae Brown, also attributed to Einstein

Little men with little minds and little imaginations
go through life in little ruts,
smugly resisting all changes which would jar their little worlds.
- Zig Ziglar

If your only tool is a bomb,
you tend to see every problem as a target.
- Jonathan Lockwood Huie

Further reading: 9 Secrets For Getting Un-Stuck

Feeling Stuck?

Be Unstoppable

Breakthrough

Letting Go

Be Creative

Another Way